Baseband unknown, imei unknown, sim not detected - Samsung Galaxy S9 Questions & Answers

Dear helpers,
I flashed my galaxy s9 with TWRP and tried to flash a rom with it.
The rom wasn't working and I had already performer a full wipe.
When installing another rom i found out that i lost my imei, baseband and my sim isn't detected anymore.
I already tried to flash stock from sammobile, but that doesnt work either.
Does anyone know the solution for my problem?
Kind regards

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[Q] [HELP]

Recently bought a F180S. Converted to E975 ROM. Everything was fine. then i started to work on EDGE problem using a EDGE img files of f180l as one online thred mentioned that it is also valid for F180S.
but when i install edge files BOOOM. Signal gone. NO IMEI with SIM card and a fake IMEI with out simcard. tried to reflash with korean ROM. no progress. tried to E975 ROM nothing happend. again tried to KOREAN RoM and installed BASEBAND nothing happend. then tried The ICS ROM (F180S10) nothing happen. now i am with a Brick can any bode help me? i have no ESF backup etc..
HELP? PLZ

[Q] HELP Please IMEI missing after flashing CM12

Hi guys
BIG problem arose
My desire 816 is A5_DWGL ...I flashed CM12 and Everything works fine except that the sim card is not detected, i changed network to 2G and does no help..Press #*06# the IMEI is null
Then i flash back to stock sense rom. the IMEIs are back too.
Is there any possible the i back IMEI from stock rom, and then flash into CM12 rom? or is there another way to get my IMEI back on CM12?
oh, i want to know why my IMEI is missing in this situation? Any explaination here will be grateful!!!
UPDATE:
I FOUND THAT MY BASEBAND VERSION IS UNKNOWN!!
HELP PLEASE !!!
After flashing CM-12, Both SIM are not working. Flashed stock L firmware but still problem is there... any solution?

Samsung Galaxy Note 2 7100N Network problem

I buy my new phone about month ago,i had 4.3 JB firmware,and then i update to 4.4.2,then i seen a problem i can't call someone,i can't use mobile internet,i can't receive a messages or a calls,i tried to downgrade again to 4.3,same problem,i tried to insert other sim card,i tried everything and nothing works,my Wi-Fi works but not Sim-Card,It says "Not Registered on Network"
bump
bump please help
Does the phone show the correct imei? Could the phone be blacklisted? Model in download mode is n7100? How did you update to 4.4.2?
Download and install MobileOdin, copy stock 4.3 on your device then install ROM from device.
tin2404 said:
Download and install MobileOdin, copy stock 4.3 on your device then install ROM from device.
Click to expand...
Click to collapse
Uradio sam to,idalje isti problem
audit13 said:
Does the phone show the correct imei? Could the phone be blacklisted? Model in download mode is n7100? How did you update to 4.4.2?
Click to expand...
Click to collapse
I know nothing about IMEI,i update it with Odin.
If the phone does not have the correct imei #, it will not connect to a carrier network.
check your IMEI by typing in the dialing screen *#06# and see if its start at 0499 or its on Null/Invalid
i had a similar problem which i updated from 4.1.2 to 4.2.2
the IMEI was correct but it still was stuck on emergency call only
i found this modem file which helped me.
i tried flashing all kind of roms with this modem but it was pointless..
until i tried flashing that Omega v4.2.2 rom and then flashed the modem again
and it actually worked..no clue how did it work on the Omega and not for the others but oh well..
now im on CyanogenMod 5.1.1 and the phone is fully working.
If you planning on doing something like that (messing with your phone rom and such..) dont forget to make a FULL backup.
kapac7a said:
I buy my new phone about month ago,i had 4.3 JB firmware,and then i update to 4.4.2,then i seen a problem i can't call someone,i can't use mobile internet,i can't receive a messages or a calls,i tried to downgrade again to 4.3,same problem,i tried to insert other sim card,i tried everything and nothing works,my Wi-Fi works but not Sim-Card,It says "Not Registered on Network"
Click to expand...
Click to collapse
I had similar problem and worked fine..download 4.3 or 4.4.2 from Sammobile stock XEO Poland or XEF France ROM. They have modem we in Croatia use. Problem is not in ROM then in your modem or your device is locked on one carier but you have wrong different carier SIM.
Or just look here for modems then flash it with Odin but over computer.In ODIN check "nand erase all".
Of course you need to wipe everything ,flash ROM then flash modem separatly but it MUST BE XEO or XEF modem !

Lost IMEI and Baseband version - NO REGISTRY ON NETWORK - PLEASE HELP - SM-A550F

Hello everyone!
I was flashing a custom rom and I realised that my sim card is not detected...
I tought that it was a problem with bootloader and modem so I flashed them and still, the sim wasn't recognised.
Then I went to the settings to check IMEI and baseband and it was unknown...
After many and many tries I still can't feagure out how to fix this...
I flashed it to a stock rom and the baseband is still unknown...
I changed the imei with xposed extension succesfully but the sim still doesn't work because of baseband.
Please help me... *I was stupid for not making a backup*
My phone: SM-A520F
DjamboBuksne said:
Hello everyone!
I was flashing a custom rom and I realised that my sim card is not detected...
I tought that it was a problem with bootloader and modem so I flashed them and still, the sim wasn't recognised.
Then I went to the settings to check IMEI and baseband and it was unknown...
After many and many tries I still can't feagure out how to fix this...
I flashed it to a stock rom and the baseband is still unknown...
I changed the imei with xposed extension succesfully but the sim still doesn't work because of baseband.
Please help me... *I was stupid for not making a backup*
My phone: SM-A520F
Click to expand...
Click to collapse
I face the prblm some days ago. And i disappointed when i saw this. At the same time my one frnd suggest me to look xda. Then i found my solution against the same of ur problem.
And now i flashed the RR rom. It running smoothly. No bugging.
---------- Post added at 04:16 PM ---------- Previous post was at 04:13 PM ----------
U should flash update modem and boot loader. After the flashing rom. I think it'll fixed ur problem 100%.
DjamboBuksne said:
Hello everyone!
I was flashing a custom rom and I realised that my sim card is not detected...
I tought that it was a problem with bootloader and modem so I flashed them and still, the sim wasn't recognised.
Then I went to the settings to check IMEI and baseband and it was unknown...
After many and many tries I still can't feagure out how to fix this...
I flashed it to a stock rom and the baseband is still unknown...
I changed the imei with xposed extension succesfully but the sim still doesn't work because of baseband.
Please help me... *I was stupid for not making a backup*
My phone: SM-A520F
Click to expand...
Click to collapse
You made sure you flashed the right modem and bootloader for your model/carrier as different ones have different bandwidths.
Sent from my SM-A520W using XDA Labs
i had the same issue , you need to flash the same firmware that came with your device but all of it ap cp csc also for bootloader use one more recent because it isnt allowed to downgrade , (for example my phone had the xeo csc and flash cos to make 4g lte working in another country and carrier but lost imei and sim , to fix it i had to flash the second XEO firmware found on sammobile witch was the one the phone had when i bought it

Help! Imei and baseband gone!

Hi, i recently installed pixel experience on my s9 g960f and i was having one little issue that was part of my fault, so i reflashed the rom completely and my IMEI and baseband is gone, my sim card wont work at all. please help!
Flash latest bootloader using twrp

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