redmi note 9 bootloop,help me plz!

[stakkio]

hello,xiaomi redmi note 9 of my friend,he just know where is on/off button and graphics icons.
he give me the phone in bootloop whit Redmi on screen.
hard reset no help,flash firmware or update error or end at 4.99%.
recovery look's ok,i can select reboot to system/wipe data/my assistant but no help.
Fastboot mode available but bootloader locked,if i try to unlock bootloader whit official app after some check's the web app suggest me to add mi account on the phone menu' but impossibile bcz phone not start
so i try to flash whit some tools...no succes,only flash by XiaomiADB whit phone in "MI assistant mode" try to flash but almost always error server or "custom flash not allowed" or similar.
i don't know what firmware have,
only info by screen of Xiaomi Mi Pc Suite i see "Version V12.0.3.0.QJOEUXM" and update available to "V12.0.10.0QJOEUXM" but if try upgrade still freeze at 0,00% or 4.99%.
Flash whit XiaomiADB give me error descripted as before maybe pics help me to more clear explain,i see on phone screen incremental upgrade bar but stop at 4,99%.
XiaomiADB format data success but not help to boot.
Opened phone and no hard damage or water inside,disconnect battery not help.
thanks for help me
SPFlashTool fear to lose NV data...maybe last chance but i need exact instructions for flash.

 

[VD171]

You can flash safely using spflashtool.
Just avoid to flash using FORMAT ALL mode, it will clear NV too.
If you flash using FIRMWARE UPGRADE mode, it will clear userdata only and relock bootloader.

 

[stakkio]

thank's
what kind of firmware need? (fastboot? update? recovery?) and what version suggest?

 

[stakkio]

i try to flash fastboot rom official,gave an flashtool error BROM etc so i switch to Firmware upgrade,flash start but end as can see at 23%.
now phone start whit redmi logo then show fastboot bunny...

what i can do now?

 

[stakkio]

updated news...
i try whit vol+ press,battery connected,download green key then connect usb cable.
flash done,look's all ok but...no imei 1 and imei 2
absolutely never used Format!!!

 

[VD171]

updated news...
i try whit vol+ press,battery connected,download green key then connect usb cable.
flash done,look's all ok but...no imei 1 and imei 2
absolutely never used Format!!!

Certainly, the old user, lost it before you get the device.

 

[stakkio]

sorry for annoyng messages,
after 1st settings of the phone and ime check i try reboot,
phone starts but still freeze on MIUI logo,
recovery menu' available,fastboot available,bootloader still locked.
actual version flashed is v12.0.3.0qjoeuxm
how i can contact you via telegram? maybe some direction for solve

 

[stakkio]

hello
some days after...finally end of the sad story
just for info,maybe help someone.
flash the engineering rom,write original imei sim 2 whit maui meta (imei on the original label package),
imei operation can do whit some methods,pytoon/libusb or mct mtk tools but maybe not need bcz the Engineer ROM look's open at mods,
switch on the phone and see very simple android system,*#06# imei appear on SIM 2,look at phone info and show imei correct but single sim,not big problem,look's all done,put sim card in and try to call,is all ok,still engineer ROM,
so i want restore the MIUI,i try the same as before crash,the V12.0.3.0.QJOEUXM,
always error in spflashtool,sometimes writing "cust. image",sometimes during "super",
whit auth file and whitout,same scatter of ROM or another for same version,always error during flash
i try to wipe data from recovery menu' (available)....result...lost imei again
so,tired,i repeat all,Eng ROM,maui meta imei,and new version (fastbootfile) V12.0.4.0QJOEUXM whitout AUTH file in FIRMWARE UPGRADE,flash done,
TADA...after MIUI boot correctly i check imei and,surprise,i have all 2 available and all 2 IMEI exact
Phone alive,SIM 1 and 2 working
i stop OTA auto update from MIUI option because i dont know what can happen if phone upgrade MIUI,notice me info about thanks.

 

[VD171]

You can upgrade your device safely.
It can't cause any damage to your device.