BST-Samsung GT-I9500 Repair IMEI, No Network, IMEI 004999

[i-am]

I had a I9300 with corrupt EFS yellow script on screen, Imei Null, unknon baseband, wrong serial number.

Repaired EFS with writing a default EFS with BST then Imei was 0049..
and yellow script from screen disappeared.
Flashed a stockrom Android 4.3 then baseband was ok.
Rooted the phone
When I try to write my original imei number into the phone with BST (instructions say checkmark Bypass Msl and Imei Patch) the baseband gets lost. The result is no connection with 523K Uart cable to write new imei.
Imei Patch destroys it.
Flashed stockrom and superroot again. Baseband ok again.
Wrote a SuperImei in the phone.
Phone works

What could I try now to get the originial Imei in my phone.
Or should i be satisfied with the working super Imei.

Thank you

[onchannel]

please someone help.


i have bst tools , latest version but it's not working anymore

Checking environment ...
System Info
Display ID: FROYO
System Ver: 2.2.1 REL
API Level: 8
Incremental: XXKB3
Model: GT-I9003
Brand: samsung
Device: GT-I9003
Platform: omap3
Language: en
Rigion: GB

Device Info
SerialNumber:
Hardware: latona
Model: GT-I9003
PDA Version: I9003XXKB3
Phone Version:
Bootloader ver: UNKNOWN
Ril HW ID:
Sales Code: SER
Model ID:
Get Bluetooth info failed
WiFi MAC: f0:08:f1:e6:c9:eb
WiFi interface: tiwlan0
WiFi state: INACTIVE
Network [1]: GSM IMEI: null
Root Access: ROOTED

Time used : 5.7 s

Writing HW ID ...failed
Writing Product Code ... failed
Writing Cal Date ... failed
Writing SN ... failed
Connect to device ...
Device Authentication ... communication failed
Please check:
1. choose the right port
2. some device UART need re-connect use each 30 seconds
Time used : 0.5 s

what can it be done? i tried many firmwares, stock, everything...bst tools can't fix this issue..

i have spent the last 5 days and still not working.

when connecting the uart cable , the phone is not recognized in windows ( as attached device ).

somene please?