Develop Bugs

SGS3 Connection Issues and Download Mode Help

There are three parts to this thread - How to get into download mode, how to get into recovery mode, and how to solve problems connecting your Android device to your computer. I think you should be able to find where each one begins without too much trouble.
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GETTING INTO DOWNLOAD MODE
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"Just get into download mode and..."
Ever find yourself with a phone that's misbehaving, and you can't seem to figure out how to get it to download mode?
Here's a list of things to try, sorted in a "where are you now" setup:
Note: You will need to use Vol+ to select download mode after you reach the mode selection screen.
FROM A POWERED-DOWN STATE - BATTERY REMOVED
- Insert battery, then press and hold Vol-, Home button, and Power.
- Press and hold Vol-/Home/Power, Insert Battery.
- Use a USB jig (can be manufactured jig or homemade chain of resistors)
FROM CLOCKWORKMOD RECOVERY MENU
- Position the cursor (highlighted selection) on "Restart device", hold Vol-/Home, then press power
- (Where available) Use the "Reboot Download" option in the "Advanced" menu
FROM A FULLY BOOTED PHONE STATE, WITH USB DEBUGGING ENABLED
Note: you may need to have ADB installed on your computer, and/or an Android Terminal Emulator installed on your Android device.
- Connect your Android device to your computer, navigate to your ADB directory, and type "adb reboot download"
- (Where available) Use the rom's power menu option to reboot into download mode.
- From a terminal, type "su", then "reboot download"
- Download the app "quickboot", follow the app directions to reach download mode.
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GETTING INTO RECOVERY MODE (CWM RECOVERY)
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FROM A POWERED-DOWN STATE - BATTERY REMOVED
- Insert battery, then press and hold Vol+, Home button, and Power.
- Press and hold Vol+/Home/Power, Insert Battery.
FROM A FULLY BOOTED PHONE STATE, WITH USB DEBUGGING ENABLED
Note: you may need to have ADB installed on your computer, and/or an Android Terminal Emulator installed on your Android device.
- Connect your Android device to your computer, navigate to your ADB directory, and type "adb reboot recovery"
- (Where available) Use the rom's advanced power menu (long press power in android OS) option to reboot into recovery.
- From a terminal emulator, type "su", then "reboot recovery"
- Download the app "quickboot", follow the app directions to reach recovery mode.
- Download the app "Rom Manager", select "Reboot to Clockwordmod Recovery"
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UNIVERSAL FIRST STEPS FOR CONNECTION ISSUES
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So you've got Odin up, the phone's in download mode, it's connected to the computer, but Odin is saying "What phone?". You've tried jiggling the handle, checking the blinker fluid levels, and even using the board stretcher, but the Android guy is smirking at you with that smug green face.
Although it is possible that there is something else at work that's preventing your phone from connecting, I would suggest trying these "universal first steps" to see if you can resolve the connection issues:
1. Turn off both devices (phone and PC) - and I do mean full power-down. Go ahead and pull the phone's battery, if necessary.
2. Disconnect your phone from your computer at all points - USB out of phone, USB out of computer.
3. Start up your computer. Don't touch it, don't do anything to it. Let it fully boot and completely settle.
(Obviously, log in if it's necessary, but then let it finish booting before moving on to step 4.)
4. Start up Odin. Let that get completely started and settled.
(If on Vista/Win 7, make sure to "Run as Administrator" in the right-click menu.)
5. Connect your USB cable to a different port than the one you last had it connected to.
(If you're on a Windows desktop, the ports in the back of the computer are generally more stable and should be used. If you're on a laptop, use USB port #1)
Do not connect the phone to the cable yet.
6. Start your phone in download mode. Wait until you see the Android guy with the 4-5 lines of text in the upper left corner.
7. Connect your cable to the phone. Let it sit until Odin recognizes it (which should only take a couple of seconds).
If, for some reason, Odin doesn't recognize the phone at this point, here are a few more things to check/try:
- Repeat steps 1-7 above, making sure to change USB ports. As dumb as it sounds, sometimes the phone or computer just doesn't like particular USB ports.
- With everything still up, switch USB ports.
- Try a different OS (if possible) - sometimes Ubuntu will recognize what Windows won't, and vice versa.
- Try doing this on a different computer - again, different OS, different USB ports, they're all links in a chain and sometimes you'll come across a configuration that doesn't have the weak link.
- Try a different cable. I've had a case where I couldn't do any flashing with one cable, but everything was rock-solid and smooth on the same machine with just a different cable.
- Fully uninstall your drivers, reboot the computer, reinstall the drivers, power down, and then start again from step 2. Sometimes faulty drivers are the problem.
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Additional Note:
If you're moving from an AOSP-based rom (MIUI, CM10, etc) to a Touchwiz-based / Samsung Stock-based rom, remember to wipe data / factory reset prior to flashing a stock rom. You will hang on the "Samsung" logo if you don't.
Please note very carefully, though, to do the wipe in CWM recovery - not 3e recovery. If you do it in 3e recovery, you'll format the internal storage, meaning you lose all your pictures, music, etc.. (I learned this the hard way.)
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If anyone has any additional items / corrections, please reply and I'll update the OP accordingly. Thanks.

Reserved

Great guide!
I'd like to add my experiences, while using CWM 6.0.1.2 booting into Recovery is a bit tricky. It appears the default recovery boots instead of CWM. The only work around I know of is to Flash ClockworkMod Recovery first from ROM Manager v5.0.2.0 and then select Reboot into Recovery. Any other method I try seems to fail.
I'm running Stock At&t ROM, rooted.

Hey Mrhaley,
I just found your post. Wish I knew I had to wipe data and factory reset before flashing stock rom... well I followed another post to use kies and now Im stuck. Im hanging on samsung logo. Can you help me fix this?
Thanks

djtiko said:
Hey Mrhaley,
I just found your post. Wish I knew I had to wipe data and factory reset before flashing stock rom... well I followed another post to use kies and now Im stuck. Im hanging on samsung logo. Can you help me fix this?
Thanks
Click to expand...
Click to collapse
OP thanks for exelent post..I had one more problem with USB connection. Sticks in usb port did not connect correctly. Just jently squize USB male connector on samsung data cable so top of male connector will bend just enough to get good connection when you push back to PC port.
@djtiko - I answer on other post to your problem..

djtiko said:
Hey Mrhaley,
I just found your post. Wish I knew I had to wipe data and factory reset before flashing stock rom... well I followed another post to use kies and now Im stuck. Im hanging on samsung logo. Can you help me fix this?
Thanks
Click to expand...
Click to collapse
Do a factory reset again, should fix you up. If not, consider using Odin to flash a stock ROM package.

Thanks got it all fixed, just had to do a data wipe in the stock recovery and then I was golden

ondin
Hey guys when i run the bootloader file should i open it up in the pda tab on ondin or in the Bootloader tab?

Should be in the pda tab I believe.
Edit. Which bootloader file are you referring to? To know for sure, you could just flash the entire stock rooted jelly bean Rom.

If using Odin with Chainfire to auto root just to root I found that the file that you are using to root you HAVE to have in the SAME folder I made the mistake of downloading the Odin then Odin with chainfire from http://forum.xda-developers.com/showthread.php?t=1963790 then was opening the odin first downloaded then it would stall for not able to start the installation then rechecking the unzipped folder for the .tar.md5 file noticed that Odin was there too, loaded it and PRESTO rooted in less than 30 seconds... So for other that are just looking to root give chainfire a check, yes you would need to use the triangle away if you are worried about that however you don't loose anything when doing it this way so all a matter of what you are looking to do. THANK YOU so much for the help with the drivers issues!

[Guide]How to root t-mobile/koodo galaxy s2 ics 2.3.5, 2.3.6, 4.0.3, and 4.0.4

I am NOT responsible for ANY damage done to your device!!!:angel:
this is ONLY for t-mobile and koodo galaxy s2 t989
DO NOT USE ON ANY OTHER DEVICE OR RISK BRICK!!!
HOW TO ROOT
what you well need:
galaxy s2 root package (link at bottom of thread)
galaxy s2 t989 (ovisly)
micro sd installed in your phone
usb debugging turned on
extract and install everthing
1. Plug in your phone to the PC allow everything to be installed.
Do not interrupt until everything is finished installing.
2. Unplug your phone and shut off your device.
3. Go into DOWNLOAD mode
on t-mobile hold volume up and volume down then hit power and press volume up to confirm into download mode
on koodo hold volume down and hit power then press volume up to confirm into download mode.
4. open odin (your phone should be detected under COM)
5. click PDA and goto desktop and open folder recoverything then select recovery-clockwork-5.0.2.7-hercules
and hit open.
6. Click Start.
7. it should flash fine and reboot your phone.
8. unlock your phone then goto the notification pull down and click on the usb storge thing and press activate usb storage.
9. on your computer open up your sd card by going to your phone going to external_sd and
open SUPER USER ROOT ACCESS and drag and drop CWM_Root_Superuser_3.1.3_Busybox_1.20.2 onto the external sd
NOT INTERNAL!!!!
TO GET SUPER USER ACCESS
1. Launch CWM Recovery by...
on t-mobile and koodo hold down volume up and volume down and hold power for 2 sec then after 2 sec relese power but keep
holding vol up vol down until you launch in cwm recovery.
2. hit vol down 4 times then power 2 times then find CWM_Root_Superuser_3.1.3_Busybox_1.20.2 and hit
power then goto yes with vol down and hit power then goto ***go back*** and hit reboot
3. YAY!!! you now have rooted your phone!!! to check, unlock it then goto applications and look for
superuser if its there you have succesfully rooted your phone!!!
4. HAVE FUN!! :victory::victory::victory:​

droid noob?? Ive dug around looking for this answer.
techguy3000 said:
I am NOT responsible for ANY damage done to your device!!!:angel:
this is ONLY for t-mobile and koodo galaxy s2 t989
DO NOT USE ON ANY OTHER DEVICE OR RISK BRICK!!!
HOW TO ROOT
what you well need:
galaxy s2 root package (link at bottom of thread)
galaxy s2 t989 (ovisly)
micro sd installed in your phone
usb debugging turned on
extract and install everthing
1. Plug in your phone to the PC allow everything to be installed.
Do not interrupt until everything is finished installing.
2. Unplug your phone and shut off your device.
3. Go into DOWNLOAD mode
on t-mobile hold volume up and volume down then hit power and press volume up to confirm into download mode
on koodo hold volume down and hit power then press volume up to confirm into download mode.
4. open odin (your phone should be detected under COM)
5. click PDA and goto desktop and open folder recoverything then select recovery-clockwork-5.0.2.7-hercules
and hit open.
6. Click Start.
7. it should flash fine and reboot your phone.
8. unlock your phone then goto the notification pull down and click on the usb storge thing and press activate usb storage.
9. on your computer open up your sd card by going to your phone going to external_sd and
open SUPER USER ROOT ACCESS and drag and drop CWM_Root_Superuser_3.1.3_Busybox_1.20.2 onto the external sd
NOT INTERNAL!!!!
TO GET SUPER USER ACCESS
1. Launch CWM Recovery by...
on t-mobile and koodo hold down volume up and volume down and hold power for 2 sec then after 2 sec relese power but keep
holding vol up vol down until you launch in cwm recovery.
2. hit vol down 4 times then power 2 times then find CWM_Root_Superuser_3.1.3_Busybox_1.20.2 and hit
power then goto yes with vol down and hit power then goto ***go back*** and hit reboot
3. YAY!!! you now have rooted your phone!!! to check, unlock it then goto applications and look for
superuser if its there you have succesfully rooted your phone!!!
4. HAVE FUN!! :victory::victory::victory:​
Click to expand...
Click to collapse
Suppose I do this ^^^^^^ and all goes well
next, if I use kies to upgrade to JellB will I still have root? Or should I upgrade to JB first and then root? I will likely use a custom rom anyway, but Im the kind to wanna go one step at a time and not just jump into someone elses build. Possibly building my own once I see things a little better.
Thanks in advance
Dee

dhangejr said:
Suppose I do this ^^^^^^ and all goes well
next, if I use kies to upgrade to JellB will I still have root? Or should I upgrade to JB first and then root? I will likely use a custom rom anyway, but Im the kind to wanna go one step at a time and not just jump into someone elses build. Possibly building my own once I see things a little better.
Thanks in advance
Dee
Click to expand...
Click to collapse
You can update to JB and just root it from there
Sent from my SGH-T989 using Tapatalk 2

13~BigBear~13 said:
You can update to JB and just root it from there
Sent from my SGH-T989 using Tapatalk 2
Click to expand...
Click to collapse
thanks for responding to the noob. Update successful now I will try this method.

recarcto the
Super easy, but when I launch titanium backup it says "sorry I could not acquire root privileges"
since the phne was used I tried again thinking it was rooted, but still same message. Oddly super user won't disappear.
IDK if its the CWM_Root_Superuser_3.1.3_Busybox_1.20.2 is the issue or not but I found "Superuser.zip" file from a different sight.
It is trusted as well, so well see if it does the tirck...
IT DID NOT!
superuser still apperas but titanium backup says could not gain root access.
Really strange cuz superuser appeared after both times. and the subsuqnet third...HOw can I make super user go away now? I thought repeat process would unroot but that seems not to be the case.
any advise would be grand.
*****************************************EDIT**********
Just in case for future droid noob like me (bs I can't put links till i have 10 posts)
I figured it out...4 hours later....There is no guide for this and I may be lucky my trial and error's did not brick the device but I was careful.
What I had to do to get the t989uvmc6 root permissions was easy as pie, but it was finding the right components so here they are. Perhaps I should start a new thred.
*First kies to 4.1.2 -----> h
ttp://
ww
w.sam
ung.co
m/u
s/ki
es/
*Second, phone in download mode (phone off hold volume and plug in usb cable) *A note here I did turn on "usb debugging" in developer options, general settings, but I'm,not sure it was mandatory
*Third run oden 307 ----> htt
p://an
droid
lege
nd.
com/
odin-m
ulti-downloa
der/
*fourth, in oden use TWRP Touch Recovery 2.5.0.0 -----> h
ttp:
//tec
her
rata.c
om/
file/tw
rp2/
herc
ules/op
enrecov
ry-twrp-2.5
.0.0-hercu
les.tar
Let everything happen. Once all this is done and nothing is happening shut phone off.
*fifth, Whatever mode its called when you hold both volume buttons then press power till feel one vibration and let go power button (keep holding volume buttons)
*sixth, You will get the TWRP screen. touch the reboot option then touch the system optoin (after this it is pretty much duhmmy proof mode)
It will say system is not rooted want to root slide for yes (duhhh)
magic will happen excitement ensues. phone restarts
Last, once the phone starts go to apps and youll see the superuser icon click it (it gives you options READ THEM and more duhhhh mode happens)
it will tell you the magic is not quite done yet.
Go ahead and follow the instructions. (or just install superSU should work too) (must have data or wifi!) There is a diff way here for sure
There are two options I choose the one recommended which was to download it
(it was the option on right of the screen and NOT the "play" icon on the left. I can't remember the name of that choice as im tired right now)
None the lesss it will be in the description given to you, you did read it and skip this, right?
Once you have superSU downloaded some other $%*# happens the phone will reboot it self on last time showing some quick command line (well mine was quick)
then when you get back into the "main" os go apps and you should see a different icon called superSU
you will then be rooted. Find a root app like titanium backup to be sure
So now Ive done all that somone skool me on the easier softer way?
Hope this helps someone cuz it would have helped me!
Now,
To hope the battery lasts more than 4 hr!

Can somebody help me? I have a T-Mobile Samsung Galaxy s2. I had it rooted on 2.3.5 (or 2.3.6 not sure). Now its 4.4.2. I flashed a updated radio and Hellkat-20140105-Hercules and 4.4 gapps. It was successful but I lost root and now gallery and camera does not work any more. I'm stumped. Can somebody direct me to the right path?
Sent from my SPH-L710 using xda app-developers app

[Q] WTF is "download mode'?

OK I have a Galaxy Tab3 GT-P5210, I have developer usb debugging enabled, I have the Samsung KIES package installed on my PC and I've downloaded Odin307, the TWRP package and the ROOT package that is well documented in this guide: http://forum.xda-developers.com/showthread.php?t=2525630
The problem I'm having is with the step that says:
Power down your device and put it into download mode. To do this, press and hold the Home + Volume Down + Power buttons simultaneously for 3 to 5 seconds until you see the warning screen.
When I do this it goes into something called 'Android System Recovery <3e>" with a prompt that says "# MANUAL MODE #" with the following options:
reboot system now
apply update from ADB
apply update from external storage
wipe data/factory reset
wipe cache partition
apply update from cache
and it does not show up in Odin so I cannot get further...how can I resolve this?
as a rant here, I really wish Google would mandate that all providers supply an option to root the device and install stock Android...this nonstop jumping thru hoops just to have basic control over a device you spent good money on is ****ing stupid

Found your problem!
snafu7x7 said:
OK I have a Galaxy Tab3 GT-P5210, I have developer usb debugging enabled, I have the Samsung KIES package installed on my PC and I've downloaded Odin307, the TWRP package and the ROOT package that is well documented in this guide: http://forum.xda-developers.com/showthread.php?t=2525630
The problem I'm having is with the step that says:
Power down your device and put it into download mode. To do this, press and hold the Home + Volume Down + Power buttons simultaneously for 3 to 5 seconds until you see the warning screen.
When I do this it goes into something called 'Android System Recovery <3e>" with a prompt that says "# MANUAL MODE #" with the following options:
reboot system now
apply update from ADB
apply update from external storage
wipe data/factory reset
wipe cache partition
apply update from cache
and it does not show up in Odin so I cannot get further...how can I resolve this?
as a rant here, I really wish Google would mandate that all providers supply an option to root the device and install stock Android...this nonstop jumping thru hoops just to have basic control over a device you spent good money on is ****ing stupid
Click to expand...
Click to collapse
Hey man download mode is where you flash custom recoveries and custom or stock Roms on your device. The answer to you for download mode is your not holding it down enough. first power off the device. Second hold these buttons all together: power + Volume Down + home button. Keep holding these buttons for a minimum of 10-15 seconds or more and it will go into download mode. From there you open up Odin on your pc and then you should see in a box your com port this means your connected. From there you it PDA and you select your recovery file. It should end with
.md5! Make sure re-partition is not checked or you will brick your device! Now it start and once it's done it will say Res OK. Good luck!

got it
JT1510365 said:
Hey man download mode is where you flash custom recoveries and custom or stock Roms on your device. The answer to you for download mode is your not holding it down enough. first power off the device. Second hold these buttons all together: power + Volume Down + home button. Keep holding these buttons for a minimum of 10-15 seconds or more and it will go into download mode. From there you open up Odin on your pc and then you should see in a box your com port this means your connected. From there you it PDA and you select your recovery file. It should end with
.md5! Make sure re-partition is not checked or you will brick your device! Now it start and once it's done it will say Res OK. Good luck!
Click to expand...
Click to collapse
You know what it was? Its a brand new tablet for me and so when it is held lengthwise (like you'd hold a phone normally) the Vol+ button is at the BOTTOM, not the top like every phone I've ever owned. So I was holding Vol- instead and that's why it wasn't working for me...boneheaded mistake but thanks for the reply...I can now boot it into Download mode ...though I still can't get Odin to recognize it
thanks for the reply

snafu7x7 said:
You know what it was? Its a brand new tablet for me and so when it is held lengthwise (like you'd hold a phone normally) the Vol+ button is at the BOTTOM, not the top like every phone I've ever owned. So I was holding Vol- instead and that's why it wasn't working for me...boneheaded mistake but thanks for the reply...I can now boot it into Download mode ...though I still can't get Odin to recognize it
thanks for the reply
Click to expand...
Click to collapse
connecting to odin is the same for every samsung device. I am going to try my best to help you out so here we go. Check to make sure you have the samsung usb drivers. to do that go to my computer then local disk then go to programs and files. if you see the SAMSUNG folder and when you open it and you see the drivers folder containg the usb drivers then if you don't see it then we need to install the drivers. first uninstall kies. you don't need this.the download and open this exe file: https://docs.google.com/file/d/0B_nizg6yUZ0NS1RodDBxd0E1MFU/preview . install it normally.
Need more help just ask

thanks
JT1510365 said:
connecting to odin is the same for every samsung device. I am going to try my best to help you out so here we go. Check to make sure you have the samsung usb drivers. to do that go to my computer then local disk then go to programs and files. if you see the SAMSUNG folder and when you open it and you see the drivers folder containg the usb drivers then if you don't see it then we need to install the drivers. first uninstall kies. you don't need this.the download and open this exe file: . install it normally.
Need more help just ask
Click to expand...
Click to collapse
After trying some different things I got Odin working, was able to install TWRP and root the device so that's all good
Now I've downloaded the framework-res.apk and decompiled it, modded it as i wanted to and recompiled using the Android Multitool app and the final issue I'm having is pushing the new framework-res.apk back to the device. The Android Multitool app claims it pushes the file but it does not. So I downloaded the latest sdk and I'm going to try using the raw ADB tool to push the file and see if that works...wish me luck

You can use twrp file manger to do that.
Just copy your file to sdcard while connected to pc and then reboot to recovery use file manager in advanced settings. Find your file and copy it to where ever you need it.

[Q]E988 bricked

I have bricked lg e988 indonesia firmware rooted,updated to kitkat 4.4.2,cwm 6.4.0.4
Due to some issue I factory reset from settg menu and the phone rebooted to cwm recvry mode
I tried to rebootd to system but fail
I tried to flash stock rom via adb sideload but fail too so does with lg flash tool
So I thght smtg wth cwm then I tried to flash twrp loki 2.6 and then stuck to lg logo only until now
Pls help

You're still soft bricked, just force your device into download mode and use LG Flash Tool to return back to stock and start again.

ShadySquirrel said:
You're still soft bricked, just force your device into download mode and use LG Flash Tool to return back to stock and start again.
Click to expand...
Click to collapse
Thank you for the respond. Mind if you share me on how to force my device into download mode?
I have tried the power + volume keys combination but nothing happened, back and stop at lg logo
Before i flash the twrp, i tried the LG Flash Tool, but i wont recognize the phone, something like usb connection issue

hotmatua.parulian said:
Thank you for the respond. Mind if you share me on how to force my device into download mode?
I have tried the power + volume keys combination but nothing happened, back and stop at lg logo
Before i flash the twrp, i tried the LG Flash Tool, but i wont recognize the phone, something like usb connection issue
Click to expand...
Click to collapse
If I remember correctly (please check threads here, it's been a long time since I've used this device, so memories are fading), download mode is activated when you press Volume Up (or both of volume buttons) and insert USB cable. I know that E98x has some strange button sequences, like rebooting to recovery is a two step operation (Volume Up + Power until navbar blinks, then power button twice, that's the only way mine wanted to boot into recovery), so please check around.
As far as USB connection issues, don't use USB3+ ports and if you're on Windows 8.1+ and later, run with Administrator privileges. I never experienced that one (used LGFlashTools from inside VirtualBox running Win XP for all my needs, I'm not a Windows user), so can't really help much but forums are full with explanations how.

ShadySquirrel said:
If I remember correctly (please check threads here, it's been a long time since I've used this device, so memories are fading), download mode is activated when you press Volume Up (or both of volume buttons) and insert USB cable. I know that E98x has some strange button sequences, like rebooting to recovery is a two step operation (Volume Up + Power until navbar blinks, then power button twice, that's the only way mine wanted to boot into recovery), so please check around.
As far as USB connection issues, don't use USB3+ ports and if you're on Windows 8.1+ and later, run with Administrator privileges. I never experienced that one (used LGFlashTools from inside VirtualBox running Win XP for all my needs, I'm not a Windows user), so can't really help much but forums are full with explanations how.
Click to expand...
Click to collapse
Thank you very much...now the phone is back to initial state. This what i've done:
1. Download LG Flash tool from http://lgflashtool.com/
2. Download LG USB Drivers from http://lgflashtool.com/
3. Install LG flash tool and LG USB Drivers
4. Plug usb cable to phone
5. Hold volume buttons and then plug the usb cable to PC (i use win 10)
6. Voila, the Download Mode icon is showed up
7. Run LG Flash Tool (Administrator privilege) & follow the instruction (i use e988 v20c stock firmware)
8. Phone back to normal (only if you use the correct stock firmware)
A very big thanks to ShadySquirrel
Hopefully this thread can also be used as reference for anyone who has the same issue as i had

How Can I Get My Samsung Galaxy Grand Prime J2 Phone In To Fastboot And Install TWRP

Hello:
I use the Samsung Galaxy Grand Prime Plus J2 Phone.
I want to root my phone using the latest version of Magisk, 22.0. But I also have to install the TWRP custom recovery. Well I don't know how to get the phone in to fastboot to enable me install the recovery.
So, I will be most grateful if I can get some tutorial on how to boot the phone in to fastboot and subsequently install the TWRP custom recovery latest version.
Hope my question is well understood.
Thanking you in advance for your help.

The usual way to put the majority of Android phones into fastboot/odin/download mode is to :
Have the phone off
Hold down the volume down button
Hold down the power button to switch the phone on
Release the power button when the screen switches on
Release the volume down button when you’re in download mode
It’s easy to remember : volume down is for download mode
Likewise, to boot into recovery (to get your device back up), do the same while holding down the volume up button.
If you have an extra button (such as the home button on older Samsung phone), hold it in addition to the volume buttons.
(Some devices use other methods to enter different modes. I’ve seen :
Holding down both volume up and down buttons while pressing power
Holding either volume up/down while plugging the USB cable to a computer
All start with the phone switched off.)

As for TWRP, a quick search led me to https://forum.xda-developers.com/t/...axy-j2-grand-prime-plus-sm-g532f-g-m.3616589/
You’ll most probably need a Windows computer with Odin to flash TWRP for the first time. Once it’s done, you should be able to do without.