christiansenn wrote:

Can I go from 1011 version to latest may version
or must go 1025 first?

Flashing can be made to any ROM, Local file update must be made one by one.

Ok very easy to upgrade to latest

1: Download rom and unpack .zip file
2: install USB drivers MT65xx USB VCOM DRIVERS
3: power off phone and disconnect from pc
4: run SP_Flash_Tool_v5.1628_Win and choose the rom and click download
5: uncheck userdata so it dont wipe your data
6: connect powered off phone to pc
7: the program will auto start flashing
8: once it is finihsed disconnect phone and power it on
done