From TJC

I try flash modem EU on Intex. It's not work and try erase modemst1, modemst2 and flash persist.
Try with QTSP and QXDM flash values from Jolla C on Intex (like manual unlock bands on OnePlus One ).
Try custom values. Driver to connect with QTSP/QXDM in Diagnostic mode https://yadi.sk/d/by5jzvtZuVZwH (Lenovo Diagnostic Interface)

It's all not work.

Thanx Coderus and russian community, who trying with me and help.

Have any ideas ?