Chosen Solution
Originally no imei and blank modem firmware, found C23 was damaged and replaced it, IMEI returned and was working until a few days ago, stuck on searching, no modem firmware, replaced baseband chip (U1_RF) , but the modem firmware is still blank, any suggestions?
Sounds like you don’t know what you are doing. U1_RF cannot be replaced alone, you need to replace the baseband flash as well because they are encrypted as a set. After that you need to use the serial number rewriting tool to rewrite the device serial number to match the IMEI that is programmed on the replcement U1_RF, otherwise the device cannot be activated.
