Solved Samsung Galaxy S8+ Bricked After Flashing Custom ROM

The #Samsung #Galaxy #S8+ is one of the best flagship Android smartphone models released last year. This phone makes use of a 6.2 inch Super AMOLED display that reproduces brilliant colors. It also has a Snapdragon 835 / Exynos 8895 processor combined with 4GB of RAM allowing it to run any app smoothly. Although this is a solid performing phone there are instances when certain issues can occur which we will be addressing today. In this latest installment of our troubleshooting series we will tackle the Galaxy S8+ bricked after flashing custom ROM issue and other related problems.

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S8+ Bricked After Flashing Custom ROM

Problem: Hi i had a custom rom on my galaxy s8 plus duos. i decided to flash a new stock based custom rom ( meaning it was just rooted no mods were added yet) without wiping or i dirty flash the new custom rom as the saying goes. the new custom rom had an option in the aroma to update the bootloader and modem. I chose to update the bootloader and modem. Upon restart, the phone went into a plateau of apps crashing….interface going blank on me in one instance. i decided to factory reset the phone. upon booting the phone and after setup… i realized my imei was unknown. I tried flashing a combination file(nougat) but the new bootloader CRC7 blocked it (rmm state is prenormal). I decided to flash a stock CRC7 rom from sammobile. same imei unknown even on stock rom. I then decided to flash a backup of my EFS partition. the bootloader blocked it as well halfway through the flashing…giving me an error saying only official binaries are allowed. Now when i restarted the phone it immediately  went into emergency repair mode. Tried fixing it via the device initialize section in smart switch but it told me it wasn’t supported. Decided to flash back the CRC7 stock firmware again. This time the phone goes into recovery immediately with the errors: recovery cause is unknown…../EFS is invalid argument(this appears about five times) mismatched carrier id. Upon rebooting, it gets stuck at the blinking samsung logo for like forever and never completes. when i reboot again, it goes into recovery again with the same error about EFS. I believe i have messed up the EFS partition table somehow. Is there any hope of restoring my EFS partition and would the RMM PRENORMAL state reset back to normal after the 7 days wait even though i can’t boot into the system itself?? thanks for taking the time to read through my message.


Solution: The best thing that you can do right now is to download the updated stock firmware file of your phone then flash this file using Odin. Make sure to connect the phone to your computer using a working USB cord. It’s also best to try using a different computer to flash your phone firmware to eliminate the possibility of this problem being caused by your computer.  Make sure to install the necessary Samsung USB drivers in this other computer.

In case the issue persists then you will need to have this phone repaired at a Samsung service center.

S8+ Mobile Service Is Not Available

Problem: Hi there, I have a samsung galaxy s8+ through T-Mobile and out of nowhere my service has just dropped. Yes, the bill has been paid so it’s not that. The only way I can send and receive messages, get online, etc. is through wifi. In places where full service has always been there is nothing. I have restarted the phone on numerous occasions and turned it off completely, waited, and turned it back on. When it restarts it shows that I have full 3G service then within a few seconds it disappears and just shows an “x” over the service bars and says (Searching). I’m not sure what to do and I hope I don’t have to factory reset my device. I also work full time with 3 kids so I haven’t really had the opportunity to take it to the store. Any help would be greatly appreciated! Thank you!

Solution: If you can get another SIM card then I suggest that you put it in your phone. If the issue does not occur then the problem is most likely caused by a faulty SIM or your account.

In case the issue still occurs with a different SIM inserted in your phone then I suggest that you backup your phone data then do a factory reset. If this does not fix the problem then this is most likely caused by a hardware component that is not working properly. You will need to bring this to a service center and have it checked.

S8+ Keeps On Rebooting

Problem: I have a Samsung S8+ and it was working fine but one day started getting duplicate text messages so I tried to reboot to see if this would fix it. Never came back, just keeps rebooting. When it first reboots it says “installing system update”, then I get the yellow caution sign and “no command” I’m able to get into recovery and Odin mode. I’ve wiped cache, done factory reset and still same. I flashed a new boot image in odin mode, still same. I put into update from ADB and was able to communicate but had no file to update so wondering if I need an update or the full firmware to try? I also tried apply update from SD card but I get an error “unable to mount SD card” Could there be a problem with the hardware memory? Also is there anywhere to get a firmware file to try without having to pay for a fast download? Any help is appreciated.

Solution: If you already performed a factory reset and even flashed the phone software which does not fix the problem then it’s very likely that this is caused by a faulty hardware component. The best thing that you can do right now is to bring the phone to a service center and have it checked.