Upgrade IRBIS SP550 to Android 8.1 Oreo
Download latest firmware Android 8.1 Oreo for smartphone IRBIS SP550
The latest firmware android 8.1 oreo, starting upgrade from a PC with Windows 10/8.1/8/7/XP (this is a custom firmware for this smartphone, you install it as is).
The driver of the USB and software to update the firmware of the smartphone (run the .exe file for help on upgrading and starting the update).
Root firmware android 8.0.0 oreo (rip from original firmware irbis sp550).
Update firmware for other IRBIS smartphones.