After update my srt 4950h with the latest software V3.20P and did factory set/default,I was caught in this situation but managed to have a solution.first of all start by...
SRT 4950H STEPS.
1,Press menu button
2,Go to USB Expansion
3,Select USB menu
4,Press yellow button to upload
5,Select upload all software upload all software => SRT-Backup
upload data => channelist
upload key => softcam 1.key.
All your upload files will be stored in USB MENU >>> ALL or SOFTWARE.
Then you can install software and files>>> data channelist or softcam 1.key afterward.
After that start update software the same one in the Srt or any latest v3.15-20p software.When updating software it will start with SW Erase and then SW Write,on the first stage of "SW Erase" switch power OFF on the external switch and then ON after 2-5 seconds,the srt will start updating software...
1,SW Read
2,SW Erase
3,SW Write.
Your Srt will be left with the old software, mine was left with v3.09p after that process. Meanwhile you can use the one leftover or update your Srt with another software... v3.07p to v3.12p and follow the process of
upload data => channelist
upload key => softcam 1.key.
Then manual scan the missing channels of TPs 11617v and 11534v or blind scan your receiver afresh.