hello!
with new CPU you get dead phone because firmware is unknow for our program and it can not finalyse flashing correctly.
please, send this firmware file "U26_06B_PCB01_GPRS_MT6226_S01.UPU25U26V03B56" to
mt62xx@gmail.com
after you send it- next CM update will finish job correctly and phone will be able to power On