GT-I9300 big problem repair [ANSWERED]

[ikosp]

So today, after long hours I repaired I9300 (super) IMEI.
After connecting UART reported error with the connection. Android was the custom 4.3
I reflash official, the problem is not solved. UART not connection.
After the downgrade to 4.2.2 once managed to repair. So I tried to write default EFS and from that moment again UART connection error. IMEI again null / 0049 ... I was unhappy.
After continuous flash anny ROM has succes connect UART.
Default EFS affects UART connection??

My N7100 was no problem.

Really this solves the added resistor and next time it will be without complications? My PCB board is rev 1.1

Finally the repair successful, but it was hell

[EmeGSM-Wei]

Originally Posted by ikosp

So today, after long hours I repaired I9300 (super) IMEI.
After connecting UART reported error with the connection. Android was the custom 4.3
I reflash official, the problem is not solved. UART not connection.
After the downgrade to 4.2.2 once managed to repair. So I tried to write default EFS and from that moment again UART connection error. IMEI again null / 0049 ... I was unhappy.
After continuous flash anny ROM has succes connect UART.
Default EFS affects UART connection??

My N7100 was no problem.

Really this solves the added resistor and next time it will be without complications? My PCB board is rev 1.1

Finally the repair successful, but it was hell

Hi,

Write Default EFS not effect UART connection!!!

If you UART connection not working, try solve problem as follow way:

1. Make sure phone baseband working, if baseband unknown fix it 1st.
2. Check Pl2303 drivers version working or not (run bst software, check logs if you can see "OK" with green color, that mean your pl2303 working fine, otherwise install bst pl2303 driver: X:\BST\Drivers\PL2303_Prolific_DriverInstaller_v1. 8.0.exe)

Tips: Old BST PCB Adapter not working for 4.4.x, try solve HERE

Best Regards
GsmBest Team