@ Unicom,
Try to flash the set with the such firmware version: MODEM4_U_40.19.E1P. It can be found at the
www.boot-loader.com in the pcf->Z10->MODEM4_U_40.19.E1P->P2S721_U_50.20.26G_3438u_Default_Model_retail_CZ_ HU_SK_V01_1.0_1.3_3438_4620081710_sec[Retail].pcf
After flashing procedure will be completed remove phone's battery and place it back.
Best Regards
Smart-clip team
www.smart-clip.com www.scoutdongle.com www.GsmServer.com www.boot-loader.com www.smart-unlocker.com