Okay, here's the solution ...
Download needed stuff :
Lenovo_A6600D40_S325_1704051331_FRP_Remove_by_bRkA
archive pass: forum.gsmhosting.com
- Unpack, Start SPFT
- Select Download Agent - DA_SWSEC_CRYPTO20_0217.bin
- Load scatter file - MT6735M_Android_scatter.txt
- Go to tab FORMAT, select "validation", select "manual format"
- Input start address : 0x6a00000 , length : 0x100000
- Press START button, connect powered off device to cable, wait for finish.
- Boot phone into recovery menu - wipe data/factory reset, then reboot
- FRP should be gone.
If you get on screen "Tool DL Image failed" od "DL Image failed",
simply reflash device with
A6600D40_S325_1704051331 ROM.
Use SPFlashTool from first link, same procedure with DA Agent,
just use scatter from second link.
b.r.
Alex