[Lenovo P2 Guides, News, & Discussion] alirazaagha:
Hey Friends,

You must have seen very good days with Lenovo P2 but when there comes a bad day when your phone stops responding to button holds and restarts. You may or may not have a clue what to do to get your phone working again just like before.

I got into this situation where only thing my phone was able to operate was a RED LED on connecting it to my laptop. Then I had to read tens of pages on XDA to find answers to all my questions. If you are in such a situation and your phone is UNLOCKED then you have come to the right place. Procedure is quite simple but remember, I am writing this guide to define complete process from blackout to complete update so follow this guide as per your needs.

I faced this situation of Total Blackout / Dead Phone (Almost) with only Red LED working and it can be very scary. So, here is the simplest procedure you can follow. I want to appreciate all those people who helped me in finding a way to boot my phone with each and everything working. Long story short, let's get this done.

Tools Required:

I am mentioning here all the Tools you will need. I will urge you to download and save these tools in case you want to unbrick your phone any time:

1. Minimal ADB and Fastboot setup for PC

2. Lenovo USB drivers v1.1.33

3. Qualcomm USB Drivers

4. Qualcomm Flash Image Loader (QFIL) v2.0.1.9 for your PC in case you have corrupted your phone's IMEI and/ or Baseband

5. Blankflash.bat in case you want to recover from total blackout (Attached)

6. Stock MM S048 Firmware for Lenovo P2 in case phone doesn't boot

7. S048_ModemTelephony.zip in case your phone boots through Stock MM S048 but SIM isn't detected and IMEI is missing. I have made a complete modem zip file for installation through recovery.

8. S251_ModemTelephony.zip in case your phone is on latest firmware and doesn't detect SIM and has lost IMEI. I have made a complete modem zip file for installation through recovery.

9. QCN file for recovering baseband version and giving you most precious network signals. (Attached)

10. WinRAR or PeaZip for uncompressing files

I will recommend you to have a specific folder for keeping all these tools in a single place.

Procedure for Unbricking:

Before going with the procedure, make sure you have downloaded all the files you need, updated Lenovo and Qualcomm drivers etc. Here is the procedure:

1. If total blackout with red LED notification when connecting to PC: Unzip blankflash.zip to a folder in C drive. Now connect your P2 to PC through USB, press volume+, volume- and power button simultaneously and double click blankflash.bat. You might have no success in your first try. Just keep trying and it will load your phone to Fastboot. Restart your phone in TWRP if installed and install a working ROM for your phone after doing a wipe. If all is good and phone works OK then great but if you have lost IMEI and baseband then it is better to reinstate your phone through first MM stock ROM S048

2. Install S048 firmware through Minimal ADB and Fastboot - use flash instructions in .txt file.

3. Wait for startup of phone. Check if fingerprint, BT, WIFI and SIM work if all work then OK.

4. If fingerprint, BT, WIFI and SIM are not working then check IMEI through dialer. Dial *#06#. If IMEI is not available then install latest TWRP through Fastboot.

5. Start P2 in TWRP recovery and install S048_ModemTelephony.zip. Restart phone to see if WIFI and SIM work.

6. If SIM is detected but not giving signals and Baseband is shown as unknown then extract 000000_0.qcn file given in .7z and restore through QFIL and restart your phone into Fastboot.

7. Now, install stock recovery of S048 firmware through Fastboot and restart your phone.

8. Use your phone like you normally do and update your P2 till firmware S251 and see if everything works including calls. Update your phone through OTA.

9. After OTA installation, stock recovery may say that update failed. Just press Back, go into Wipe user data menu and Wipe Cache only. Restart your phone which will be updated to latest version and will ask you to update to a newer version. Allow it to download the next update.

10. After installation of S251 update, install latest TWRP through Fastboot and install most recent version of LOS 16 so that your vendor partition is stable and free from any bloated files. Now, use your phone just like you want to.

If you need further clarification then ask in this thread.