Lenovo A1900 Flash File Stock Firmware ROM
- Open the Research download tool > bin folder
- Launch ResearchDownload.exe
Click on the Load Packet icon (top left corner)
In the window that pops up, navigate to the location of the .pac file, select it then click Open
The pac file should now be loaded (its name should appear at the top)
Click the Settings Icon (top left corner)
In the box that pops up, untick any item(s) you do not wish to flash then click OK. Ignore this step if you wish to flash all files
Click the Start downloading button
You should see Waiting…. under the Progress bar
Switch off the phone (still with battery inside) then connect it to the PC via USB cord (note that you might need to hold the volume decease button while connecting to PC on some phones) and flashing should begin. DO NOT interrupt
Once flashing is complete, you’ll see Passed
Click on the Stop downloading icon then disconnect the phone from PC and boot
Lenovo A1900 Flash File Stock Firmware ROM
Download Link:: Link