[Lenovo A850] irfanadli97:
hi XDA community i have a problem regarding my a850 and i hope u or anybody can reply this comment in an instance cuz im in emergency...

IM EXPLAINING MY PROBLEM VERY DETAILED SO IT'S GONNA BE VERY LONG COMPOSITION, INCLUDING FROM IM ROOTING THE PHONE UNTIL I TYPED THIS COMPOSITION

so recently i "Framarooted" my device and was working properly as i expected,then i want to install TWRP, i see my baseband version does not have ROW or CN in there, it kinda like "A850.V13 ...(cant remember)", but i flashed anyway using the ROW version of TWRP and Mobileuncle MTK Tools. When I want to enter recovery (via MTK Tools) it doesnt show up, just stuck at white,big "Lenovo" logo (it probably doesnt work) but i was able to boot back to normal. Then i used System App Remover from Play and attempted to delete some chinese apps, and I DID a mistake... i was so clumsy enough to delete all chinese apps that origins from the rom i accidently deleted the file "classical" (which i guess the entire system ui, launcher etc) . Upon after deletion of that file I SHOULD HAVE NOT DELETE , it suddenly booted off with the startup sound muted halfway (its like, the boot startup sound have like 4 second duration and i heard the sound just for 1 sec).

Then it boots up again, but stuck at the logo "Lenovo For Those Who Do" after startup animation, so i assume this is bootloop or soft brick

Realising this incident i GOOGLED " a850 bootloop","a850 unbrick","a850 stock rom","a850 emergency reset" and "a850 emergency backup", then I found a website which describes how to flash stock rom to a850, so i did that, as it might work, but actually not for my case. I followed and downloaded exactly steps and files from that website and loaded Flashtool with its scatter file, then ticked PRELOAD and selected the preload.img, followed by checking USB mode ,clicking "Forced High Speed", checked the DA DL thingy, clicked Firmware Upgrade and the progress bar moved, after that i plugged my phone, without battery, to the pc via usb. I heard the hardware insert sound, but, Flashtool did not start flashing, it;'s still SEARCHING.

Then I read that u need the USB drivers, so I assume i do not have drivers for this phone. I used the Device Manager step and when I plug my phone, it pops up "MT65xx Preloader"(or MTK i dont remember) then I quickly rightclick and "Update Driver". It has two selections, ONLINE or BROWSE, so i clicked the online solution, but Windows seems cant find the driver i need,

so i used BROWSE option, which i used your usb driver by entering the directory of the driver in your file in "C:\Users\User\Downloads\Compressed\Lenovo_Drivers_SP_Flash_Tool_v3.1316.0.150\Drivers" clicked install then it pops up an error "The third party INF does not contain digital signature information", so it doesnt install. So I used USBDeview and plugged my phone again without battery, it pops up "MT65xx Preloaded" with a purple dot, and if you need, i rightclicked that purple dot and clicked PROPERTIES, and here's information it gave:

Device Name: MT65xx Preloader

Device Type: CDC Data

Description: MT65xx Preloader

Connected: Yes

Safe to Unplug: NO

Disabled: NO

USB Hub: NO

Drive Letter:*blank

Serial Number:*blank

Created Date: 12/10/2014 2:01:15 AM

Last Plug/Unplug Date:12/10/2014 2:01:15 AM

VendorID: 0e8d

ProductID :2000

Firmware Revision : 1.00

USBClass: 0a

USBSubClass:00

USBProtocol: 00

"Hub Port" until "DeviceMfg" is blank

Power: 500mA

USB Version: 2.00

Driver Description: *blank

Driver Version:*blank

Instance ID: USB\VID_0E8D&PID_2000\5&9ec43f0&0&9

After checked, i resorted to HARD RESET via recovery (i tried to go to recovery again to see there's hope in there) and it BOOTED TO RECOVERY! (yay) but again problem strikes, the recovery I see now is FULLY CHINESE i dont understand even a single option i gave there.

So now my phone condition is still cant boot to launcher, and my very last resort is to use the JTAG option

pls help me u all and pls reply ASAP

thank you