DD Free Dish has undergone some changes that could be causing older set-top boxes to no longer receive certain channels, including educational TV channels because of Change in Technology (MPEG-4 Upgrade): DD Free Dish has upgraded its broadcast technology from MPEG-2 to MPEG-4 for educational TV channels. Older set-top boxes only support MPEG-2 and cannot decode MPEG-4 signals.
Now all the educational channels are being broadcast in MPEG-4, which may be the cause of the issue.
Suppose you are scanning and setting your dish antenna repeatedly because Sometimes, the receiver settings might need to be updated manually. This includes adjusting the transponder settings and ensuring the correct frequency and symbol rate are set. But you will not receive DD Free dish educational TV channels to do it.
The DD Free dish educational TV channels by SwayamaPrabha, Digishala, PM-eVidya, and Vande Gujarat are reallocated to MPEG-4 frequencies or transponders.
So consider upgrading to an MPEG-4 compatible set-top box to continue receiving all channels, and confirm that your set-top box supports the latest technology used by DD Free Dish.
If you have any questions in your mind, then you can ask using the comment section.
You can find the latest updated DD Free dish MPEG-2 channels list, and Educational TV channels in MPEG-4 technology here.