WIFI Scan Doesn’t Find Any SSID’s - Verizon Galaxy Note 4 Q&A, Help & Troubleshooting

Wi-Fi works with all existing, configured AP's. It can’t find new ones during scans. I was in a motel all last week and couldn’t detect the local Wi-Fi. I could manually add it and it would work. I don’t know when it started but it was working not too long ago and I haven’t made any major changes to the phone recently. I loaded Wi-Fi scan app and it detects and connects to mine and my neighbor’s AP's so I suspect it’s not the hardware. Settings look good. I disabled AppOps and unfroze anything that might be related. I can't boot to safe mode. I think it's because of exposed. https://forum.xda-developers.com/xposed/tool-samsung-xposed-safe-mode-disabler-t3652781
SM910V, rooted, 5.1.1
Thanks, Geno

I thought I'd bump this. The only thing I did since the original post is to TWRP the phone back to an earlier date before I set it up to my preferences. It worked there but there's to many custom setups to start again from there. The WIFI manager app does what I need and was quick and easy.

Related

Returned home from short trip, Wifi connects but does not function

As the title says, I didn't change anything about the phone's configuration when I was out, didn't download any new apps or change any settings that would interfere like this. No one else has changed my home network in my absence.
Nevertheless, most of my apps, such as Instagram, the Play Store, Twitter, Wikipedia, Chrome; almost all their requests time out. There seem to be short windows where data will load, and Instagram appears to load comments and post metadata, but no images. It's basically unusable. Occasionally an exclamation mark will pop up over my Wifi symbol in the notification center. Strangely, I can still reach my Steam and Battle.net authenticators, but the moment I try loading the Steam app, nothing comes up. It's like the device can only handle plaintext over Wifi.
All of the apps work fine over cellular data.
Also, there is a toast that appears whenever I restart my phone that says "Power On" that I've never noticed before. I was rooted using Xposed, the only modules I used were Snapprefs, Xinsta, Physical Button Music Control, and Greenify Experimental Features, all of which I uninstalled. The toast still appears with the latter two disabled. Only other rooted apps I had besides Xposed were Nova Launcher, Greenify, Busybox, and Root Checker Basic, all of which have been removed but Nova.
I am running 6.0.1 with the latest update.
Any ideas? I am still within 15 day warranty so I could theoretically return the phone (which I was contemplating doing anyhow since 10gb of functional storage is a bit too small for me), but would rather not have my hand forced, and eat into my cell data plan.
So far I have tried forgetting the network, wiping cache/dalvik with TWRP, removing the Google VPN, resetting all network settings, and a couple things I can't remember offhand now. Any suggestions will be appreciated.
AbanadonedFace said:
Any ideas? I am still within 15 day warranty so I could theoretically return the phone (which I was contemplating doing anyhow since 10gb of functional storage is a bit too small for me), but would rather not have my hand forced, and eat into my cell data plan.
So far I have tried forgetting the network, wiping cache/dalvik with TWRP, removing the Google VPN, resetting all network settings, and a couple things I can't remember offhand now. Any suggestions will be appreciated.
Click to expand...
Click to collapse
First, if you want to return your device because the 16gb model doesn't have enough space, go ahead.
If it is mostly because of this WiFi issue, I wouldn't return the device, it is almost certainly the case this is some configuration issue (possibly in concert with some Android bug) which can be resolved.
Is it possible when you came home the device connected to a neighbor's AP and thus you couldn't use data, but it wasn't immediately obvious, so you ended up forgetting your own network and reentering the config, but the key was off by a little, and from that point on, it was just assumed the wifi config was correct?
When you say Google VPN, are you using WiFi Assistant and Project Fi? Have you tried disabling auto-connect fir the WiFi Assistant?
Have you tried using the old Lollipop DHCP client (perhaps your IP address got used by another device and the new Android client doesn't handle that well?) Just grasping at straws.
Have you tried turning on Bluetooth while WiFi is on? Perhaps there is a bug with them working independently of each other in certain situations.
sfhub said:
Is it possible when you came home the device connected to a neighbor's AP and thus you couldn't use data, but it wasn't immediately obvious, so you ended up forgetting your own network and reentering the config, but the key was off by a little, and from that point on, it was just assumed the wifi config was correct?
Click to expand...
Click to collapse
I am 100% positive I am on my own home network and that I used the correct key. I'm not sure what you mean with regards to the rest of the 'config', I have always used the standard wifi configuration, just typed in my key and had it work.
sfhub said:
When you say Google VPN, are you using WiFi Assistant and Project Fi? Have you tried disabling auto-connect fir the WiFi Assistant?
Click to expand...
Click to collapse
I actually forget what it was called, it was under Settings>Wireless&Networks>More>VPN. There was one entry there with an icon. I forget the name of it, but the icon looked like a stock Google icon and I think it had google in the name. I am on Project Fi, not using any wifi assistant (at least not in Advanced Wi-Fi Settings), but when I tried to toggle that option on just now, something called "VpnDialogs" crashed, so I assume that VPN entry was that. But again, the assistant wasn't on.
sfhub said:
Have you tried using the old Lollipop DHCP client (perhaps your IP address got used by another device and the new Android client doesn't handle that well?) Just grasping at straws.
Click to expand...
Click to collapse
I did, when I first googled this was one of the things I found, sadly it did not help.
sfhub said:
Have you tried turning on Bluetooth while WiFi is on? Perhaps there is a bug with them working independently of each other in certain situations.
Click to expand...
Click to collapse
I don't use Bluetooth, and trying to toggle it off/on from the control center just gives me a repeated "unfortunately, Bluetooth Share has stopped" error message.
I have decided to get the 32GB 5X since I do want more storage, but since I would like to be able to root my phone again and use Xposed, I would still like to hear any other ideas you have for troubleshooting this problem in case it reoccurs.
I reflashed the latest update to see if that would fix it, no dice. When I send the 16GB model back I have to factory reset it anyway, so I suppose I'll know if that does it.
What puzzles me is why I can load text from instagram posts that have been posted while I've been having this problem, but not images. Makes me think that maybe my connection is being super throttled somehow rather than non-functional, but my PC's speeds are normal. Perhaps some internal part is damaged? I do have a case and it hasn't taken any serious tumbles, but it has had one or two small falls from maybe 2 feet high.
AbanadonedFace said:
What puzzles me is why I can load text from instagram posts that have been posted while I've been having this problem, but not images. Makes me think that maybe my connection is being super throttled somehow rather than non-functional, but my PC's speeds are normal. Perhaps some internal part is damaged? I do have a case and it hasn't taken any serious tumbles, but it has had one or two small falls from maybe 2 feet high.
Click to expand...
Click to collapse
It is easy to test if you have some network connection vs none.
In terminal or adb shell
ifconfig wlan0
ping www.google.com
1st command will tell you (among other things) if your wlan picked up an IP address.
2nd command will test whether you can send ping packets over your connection.
I'm sure there are millions of ways of doing the above, I just gave you one example.
Strangely, the solution seems to have come from factory resetting my router. I ruled this out initially because my other old phones were working fine on wifi, my phone is now getting WiFi again.
Now to figure out what the hell this "Power On" toast is about...
AbanadonedFace said:
Strangely, the solution seems to have come from factory resetting my router. I ruled this out initially because my other old phones were working fine on wifi, my phone is now getting WiFi again.
Now to figure out what the hell this "Power On" toast is about...
Click to expand...
Click to collapse
I've encountered something similar where the router runs out of NVRAM space because it has recorded too many DHCP clients, it won't hand out new IP addresses, but if you are existing or already have one, it is fine.

WiFi and Bluetooth won't turn on - Hardware defect or persist folder?

Hey all,
So I've been working on this for quite some hours now for two nights, but I'm done for and hope someone can give me clarity:
HTC One m9, running stock, latest update VDF Germany, Android 6.0.
Problem occured last week. I was using the phone quite extensively (yeah, tbh I was playing Pokemon Go... like a lot). With it being constantly on wifi/4g/GPS and all, charging it all the time, the battery also became quite warm.... And then while walking about it crashed and rebooted. I never had such a crash before tbh. After Reboot HTC Error Report even popped up and I also sent it. Then I found that the Bluetooth and Wifi Connections were off, which I usually both have activated all the time. And now I cannot turn them on anymore. No matter which shortcut is used. Wifi displays "error" after some minutes, while BT is just greyed out after triggering. Wifi Mac is showing with a 02:00:00:00:00 now as well.
So I did my research and performed quite some things, trying to get it fixed, because I am still not sure wether this is a Hardware or Software issue. A lot of people reported the issue at least for the wifi part. Less people reported it for both, wifi and BT, but I would guess that not too many people use BT regularly anyway. I found one person mentioning, that if both is not working it is most probably a hardware related issue. Which was my first thought exactly, thinking it overheated, something had gone loose internally and now the antenna is killed or at least not connected anymore.
As for the physical methods, I only tried the "whacking the back part of the device"-technique, which did not do anything. I haven't gone through "freezer" or "hair dryer" yet....
Some people were able to fix it via draining the battery and then restarting and draining again and what not.. but that all sounded weird to me.
I am still hoping it is software related so I went:
- Wifi Fix and Rescue App
- Unlock
- TWRP
- Root
- Reflashing stock
- numerous factory and network settings resets
Because I read about the /persist partition or folder and that it should contain wifi or mac address related info. Some guy had simply deleted those files and they were recreated upon reboot. But those files are not existing in my /persist folder (checked via Root Explorer - got the paid version) and I have Root - as stated above. Still that folder only lists:
\data
\display
\hlos_rfs
\lost+found
\rfs
\tee
I found a thread in google's cache of someone on how to recreate or fix that folder and contents, based on a nexus 5 however and that is probably not working on the HTC one m9 I was presuming.
So, what do you guys think?
Is there any way to get the wifi back to work? Would you say it even might be software related, looking at the persist partition/folder contents? Or am I totally wrong and the fact that BT AND Wifi are not working, rules everything else out and only leaves a Hardware Issue?
Looking forward to hearing your thoughts on this.
Thanks in advance!
- Arne
I'd bet a bollock its the hardware popped. Bluetooth and wifi are on the same board, probably the same rf chip. A local phone repair shop should ve able to fix it seeing as it's out of warranty.
Beamed in by telepathy.

Wifi turning on by itself. Should this even be possible?

Hi there,
I own a 5t since mid Jan. Did the Oreo OTA a couple weeks ago and everything was fine.
Now since yesterday I notice the wifi is suddenly on at times eventhough I turned it off!
When I see it on I turn it off again and an hour later or so it is on again!
The only change since a few days ago is software I installed through Google Play (unrooted system). I'll remove all this and see what happens as there doesn't seem to be a clear connection with anything in particular.
Should software be able to do this? Or Android even?
The system can turn WiFi on and off, yes it has permissions to do this. However it should only do so in response to a specific instruction or event.
Since you're not rooted then a non-system app won't be able to turn WiFi on or off unless you explicitly give it permission. The way I'd diagnose this is to use 'adb logcat' as soon as you notice it turn on again after manually turning it off. The log should tell you what app is doing it. If you don't know/have adb then you might be able to get a non-root logcat app from the Play Store (not sure).
Thanks!
From Android 4.1 all logcat programs need root. I'll simply remove everything I installed to see.
To come back to this and close this. I did the ota to 8.1 a couple weeks ago and going through the settings after I noticed some new location settings.
One describes exactly what I have seen. Is it a new setting or 8.0 also had it? If so it was enabled.
Anyhow 8.1 fixes it.
Enable developer option and use your PC to run logcat.
It does not require root.

WiFi connected without internet

Dear All,
My note 10+ loosing internet randomly. While checking WiFi showing the message "WiFi connected without internet". after switching on and off it reconnects but lose connection after sometime. My other android phones are connected to the same WiFi but have no issue.
Please help me solve the issue.
Thank you
Arun
i have noticed its happening during whatsapp call duo calls
arunjyothisp said:
Dear All,
My note 10+ loosing internet randomly. While checking WiFi showing the message "WiFi connected without internet". after switching on and off it reconnects but lose connection after sometime. My other android phones are connected to the same WiFi but have no issue.
Please help me solve the issue.
Thank you
Arun
Click to expand...
Click to collapse
A similar thread was made on the subject - link here https://forum.xda-developers.com/galaxy-note-10+/help/android-10-5g-wifi-dropping-t4037661
For practical intents and purposes it's almost like when the issue happens the phone is not able to resolve a DNS query. I base this on 2 hypothesis - first being that the phone is still connected to the wifi access point and can still access LAN resources. The second being that the phone must either poll the internet (i.e ping a specific address) on a regular basis. If the poll was unsuccessful it flags the connection as "WiFi connected but no internet".
The things you can try are:
update the firmware on your phone (if not already)
factory data reset (read note 1 below)
reset network settings
try a different wireless router (read note 2 and 3 below)
disable private dns (read note 4 below)
If you use tasker create a routine to automate a temporary solution (read note 5)
Notes
The issue maybe a corrupted setting within the phone. I have had similar issues before (not with just this phone) and a factory data reset helped. One thing to take note of is that after the phone had completed it's factory data reset I did not attempt to restore a backup. This is important to keep in mind because any issues that were present (due to corrupted settings) would exist also in the pre-factory data reset backup you made.
With my previous router I had this issue but had since replaced it with a Wifi 6 capable router. After getting the new router I have not had any further issues what so ever. Also make sure your wireless router is up to date on it's firmware. It maybe possible that the wireless router you have is old enough (from when it was released, not from when you bought it) that a replacement might be the only way to resolve the issue.
To help rule out a wireless router issue try using a different one. You can borrow a friend's internet connection for a while, or a public cafe or what ever. Point is you are trying to see if the issue happens again when you are using a totally different wireless access point (by totally different I mean hardware/model and not just renaming the SSID).
I had the issue happen when using private DNS. For what ever reason the issue was with the DNS provider I had choosen. Turning the Private DNS setting off helped resolve the issue. After turning the setting off it may take a bit before the phone recognizes it was turned off, but you can hasten this process by toggling WiFi off and back on.
The Tasker option is one I did and it worked quite well. You may need to adjust the routine to suit your particular needs but it's basically what is at this link here. Best part of this option is that you can have it only activate when your connected to the problematic wifi access point and every X number of minutes (helps ensure that you use it only when needed). The routine (when setup correctly) should run every 10 minutes in where it attempts to access a website and assigns the results to a variable. The variable is then checked to see if it matches a specific result (in this case an error code), and if it does match it will toggle WiFi off and back on (after a brief pause/wait period between toggle off and toggle on) automatically. Granted it sounds like a lot of work, but it's really not that complex. Also I consider this is a temporary solution because you may find that on later firmware updates applied to the phone (or you may end up getting a new wireless router) the issue will have been resolved.
"WiFi connected without internet"
I was having the same issue until I uninstalled the app "WiFi Analyzer"
mike.aguailar said:
I was having the same issue until I uninstalled the app "WiFi Analyzer"
Click to expand...
Click to collapse
Interesting! Which one? The Play Store lists several apps by that name.
WiFi Analyzer
Gary02468 said:
Interesting! Which one? The Play Store lists several apps by that name.[/QUOTE
WiFi Analyzer by Zoltan Pallagi
Click to expand...
Click to collapse

Question Captive portal driving me nuts

Tl;dr I have to log in to my work's guest wifi every day, but I didn't before. Nobody else does. Auto connect is set to on, but it doesn't work like it used to/is supposed to. My pixel 3 that I brought in works just fine.
Longer: I connect to a guest network at work every day that's meant for employee personal devices. (I use a homebrew VPN for this.) Before the issue started, I'd periodically (maybe once/month if that) have a notification when I arrived to sign in, and you click agree in a captive portal and you're on your way. Other than that it auto connects just like at home. A few weeks (?) ago however, I've started having to do this every day. If I'm disconnected for over roughly an hour (say if I leave and come back during the day) I have to do it again, and if I reboot my device I also have to sign in again. If I just toggle wifi on and off quickly then it automatically connects just fine.
Ordinarily this wouldn't be a huge deal, but where I work I basically get no cell coverage. I also have a couple tasker profiles that I've been using for years to do stuff (vibrate mode, silence media, etc) when I arrive to work, and these don't/won't trigger until I have a minute to log in. Ideally these would trigger as soon as I'm within range of the building, as I've been doing for years now.
None of my coworkers have this issue, everyone that I've asked all say their devices automatically connect just fine, as mine used to. I brought in my old pixel 3 to compare and test the behavior, and my pixel 3 works just fine, even though it hasn't been to my work in many months.
I'm assuming this is something related to my device. Because it happens if I reboot, but not if I quickly disconnect and reconnect, I'm imagining maybe something isn't being cached correctly?
If anyone can help me fix this I'd be very grateful!
(Running full stock unrooted all up to date on both phones.)
Edit: if you're having this issue, read a few replies below. Check dev options for non-persistent Mac address randomization
Just for the heck of it, have you tried:
Forgetting the network after logging into it.
Gone into your WiFi Saved Networks, forget any that look like it's your work's guest network, if any.
Turn airplane mode on.
Reboot.
Turn airplane mode off.
Log into it fresh.
See if it sticks the next day/time.
I'm pretty much grasping at straws, but worth a try if you haven't already.
More extreme measures are:
Settings / Apps / See all 999 apps
3-dot menu: Show system
Search icon
Search for both WiFi and for Wi-Fi and clear app cache and data for all of them.
Be prepared to possibly have to log back into all Wi-Fi networks you normally do.
Ultra extreme measures:
Factory reset, set the phone back up only with what you really require at first, and don't do much with the phone until you test it with your work's guest Wi-Fi for a couple of days, hopefully without trouble. If it works fine, continue installing apps in smallish groups prioritizing what's most important. Hopefully, everything keeps working or at least has worked at least after the factory reset.
Disregard below.
Any other pertinent details? Rooted? Custom kernel? Even unlocked bootloader and verity and verification disabled? I assume none of these, but just have to ask.
roirraW edor ehT said:
Just for the heck of it, have you tried:
Forgetting the network after logging into it.
Gone into your WiFi Saved Networks, forget any that look like it's your work's guest network, if any.
Turn airplane mode on.
Reboot.
Turn airplane mode off.
Log into it fresh.
See if it sticks the next day/time.
I'm pretty much grasping at straws, but worth a try if you haven't already.
More extreme measures are:
Settings / Apps / See all 999 apps
3-dot menu: Show system
Search icon
Search for both WiFi and for Wi-Fi and clear app cache and data for all of them.
Be prepared to possibly have to log back into all Wi-Fi networks you normally do.
Ultra extreme measures:
Factory reset, set the phone back up only with what you really require at first, and don't do much with the phone until you test it with your work's guest Wi-Fi for a couple of days, hopefully without trouble. If it works fine, continue installing apps in smallish groups prioritizing what's most important. Hopefully, everything keeps working or at least has worked at least after the factory reset.
Disregard below.
Any other pertinent details? Rooted? Custom kernel? Even unlocked bootloader and verity and verification disabled? I assume none of these, but just have to ask.
Click to expand...
Click to collapse
Tried 1-7 already. Rebooting makes me sign in again, regardless whether or not airplane mode is on. I nuked my entire network settings (the little circle arrow in the top right corner of the network settings page) and that didn't solve it either. (But I did have to wait for my sim to reprovision...) I absolutely will not factory reset, but given that I already did a network reset I don't think that would help.
As far as the timeframe, I'm thinking this might have popped up after the January patch. I installed that while I was on a brief vacation; unfortunately don't remember if I had the issue before I left or not.
roirraW edor ehT said:
Just for the heck of it, have you tried:
Forgetting the network after logging into it.
Gone into your WiFi Saved Networks, forget any that look like it's your work's guest network, if any.
Turn airplane mode on.
Reboot.
Turn airplane mode off.
Log into it fresh.
See if it sticks the next day/time.
I'm pretty much grasping at straws, but worth a try if you haven't already.
More extreme measures are:
Settings / Apps / See all 999 apps
3-dot menu: Show system
Search icon
Search for both WiFi and for Wi-Fi and clear app cache and data for all of them.
Be prepared to possibly have to log back into all Wi-Fi networks you normally do.
Ultra extreme measures:
Factory reset, set the phone back up only with what you really require at first, and don't do much with the phone until you test it with your work's guest Wi-Fi for a couple of days, hopefully without trouble. If it works fine, continue installing apps in smallish groups prioritizing what's most important. Hopefully, everything keeps working or at least has worked at least after the factory reset.
Disregard below.
Any other pertinent details? Rooted? Custom kernel? Even unlocked bootloader and verity and verification disabled? I assume none of these, but just have to ask.
Click to expand...
Click to collapse
I also tried looking for anything related to WiFi in all apps as suggested and anything that comes up there shows no cache/user data to clear, with clear storage and clear cache buttons greyed out.
roirraW edor ehT said:
Just for the heck of it, have you tried:
Forgetting the network after logging into it.
Gone into your WiFi Saved Networks, forget any that look like it's your work's guest network, if any.
Turn airplane mode on.
Reboot.
Turn airplane mode off.
Log into it fresh.
See if it sticks the next day/time.
I'm pretty much grasping at straws, but worth a try if you haven't already.
More extreme measures are:
Settings / Apps / See all 999 apps
3-dot menu: Show system
Search icon
Search for both WiFi and for Wi-Fi and clear app cache and data for all of them.
Be prepared to possibly have to log back into all Wi-Fi networks you normally do.
Ultra extreme measures:
Factory reset, set the phone back up only with what you really require at first, and don't do much with the phone until you test it with your work's guest Wi-Fi for a couple of days, hopefully without trouble. If it works fine, continue installing apps in smallish groups prioritizing what's most important. Hopefully, everything keeps working or at least has worked at least after the factory reset.
Disregard below.
Any other pertinent details? Rooted? Custom kernel? Even unlocked bootloader and verity and verification disabled? I assume none of these, but just have to ask.
Click to expand...
Click to collapse
Wait, I just tried something else - I switched from randomized mac to device Mac. It wanted to make me log back in again (disconnected, reconnected with different Mac address) but then I switched back to randomized mac and it connected just fine (as is usually the case if I just toggle wifi) with the last used random Mac ad.
Is there a way to reset my randomized mac address? I wonder if that Mac address has been flagged somehow on their system.
roirraW edor ehT said:
Just for the heck of it, have you tried:
Forgetting the network after logging into it.
Gone into your WiFi Saved Networks, forget any that look like it's your work's guest network, if any.
Turn airplane mode on.
Reboot.
Turn airplane mode off.
Log into it fresh.
See if it sticks the next day/time.
I'm pretty much grasping at straws, but worth a try if you haven't already.
More extreme measures are:
Settings / Apps / See all 999 apps
3-dot menu: Show system
Search icon
Search for both WiFi and for Wi-Fi and clear app cache and data for all of them.
Be prepared to possibly have to log back into all Wi-Fi networks you normally do.
Ultra extreme measures:
Factory reset, set the phone back up only with what you really require at first, and don't do much with the phone until you test it with your work's guest Wi-Fi for a couple of days, hopefully without trouble. If it works fine, continue installing apps in smallish groups prioritizing what's most important. Hopefully, everything keeps working or at least has worked at least after the factory reset.
Disregard below.
Any other pertinent details? Rooted? Custom kernel? Even unlocked bootloader and verity and verification disabled? I assume none of these, but just have to ask.
Click to expand...
Click to collapse
Holy wow I think I may have solved it. After reading this (https://source.android.com/devices/tech/connect/wifi-mac-randomization-behavior) documentation, I went to dev options and that toggle for wifi non-persistent randomization was on. I did NOT turn it on, and it is/has been OFF on my pixel 3.
Can you or someone who's reading this check if your dev setting for non-persistent randomization is on or off?
I'm about to go out to lunch, I'll report back if that fixed it and update my op.
If you mean MAC randomisation then mine is off.
My Wi-Fi non-persistent MAC randomization is disabled by default.
Mine MAC randomization is on. I have never touched it.
That could certainly cause your problem. Many captive portals work off MAC addresses.
TonikJDK said:
Mine MAC randomization is on. I have never touched it.
That could certainly cause your problem. Many captive portals work off MAC addresses.
Click to expand...
Click to collapse
Mac randomization in the network settings, or the non-persistent toggle in dev options?
asj0422 said:
Mac randomization in the network settings, or the non-persistent toggle in dev options?
Click to expand...
Click to collapse
Randomization in settings.
asj0422 said:
Holy wow I think I may have solved it. After reading this (https://source.android.com/devices/tech/connect/wifi-mac-randomization-behavior) documentation, I went to dev options and that toggle for wifi non-persistent randomization was on. I did NOT turn it on, and it is/has been OFF on my pixel 3.
Can you or someone who's reading this check if your dev setting for non-persistent randomization is on or off?
I'm about to go out to lunch, I'll report back if that fixed it and update my op.
Click to expand...
Click to collapse
Awesome, looks like maybe you solved it. Glad to hear. For the record, mine is off (by default and off now).

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