Well, with Martech upload good EEPROM, after this make "IMEI Repair", and phone should be OK. I've fix many dead S45 with this, and S46 is more/less same phone, just assembled for different market. Ofcourse, this can also be a hardware fault. Then this solution doesn't help. Basicly, idea is to upload good EEPROM in phone, fix IMEI, and reflash phone with desired firmware (not necessary, but you can make fullflash also. Fullflash means Bootcore, EEPROM, firmware). Anyway, try and post results.
Regards