I was doing a little research regarding firmware and channel listing uploads/downloads to/from the Pansat 3500 via SD card and located the following writeup elsewhere that I thought I'd share with anyone else who was curious about this topic. Evidently, it is possible to download and upload both firmware and channel listings to the 3500 through the SD card. Assuming that I'm understanding correctly that both firmware backups and uploads are possible, I think it's great that prior to upgrading my new receiver to Pansat's latest firmware, I can backup the original factory firmware in case I run into problems with the newer version. Anyway, here's what I found (I just did a copy and paste):
A. USING THE 3500 TO CREATE BACKUP DATA
1. Place SD card in 3500.
2. Enter Menu, scroll down to SD memory, press OK. Three folders will have been created on the SD card but they will be empty (this formats the SD card).
3. Scroll down to Code Backup press OK (screen will be blank), then press RED button on lower left of remote, use left arrow to go to YES and press OK (to confirm). You will have to name the bin file so name it whatever you want using the popup screen (keep the name short - 6 letters/numbers or less- something like 118bin). After naming the bin file scroll to and highlight OK on screen then press OK on remote. You will see the backup file being loaded to the card. When you see COMPLETE on the screen you're done. Press EXIT and you will see that the bin backup is in the Code Backup file folder.
4. Press EXIT once more. You will be back to the main SD screen. Scroll down to CH Data Backup and press OK then press RED button on lower left of remote again, use left arrow to go to YES and press OK (to confirm). You will have to name the channel list file so name it whatever you want using the popup screen (keep the name short - 6 letters/numbers or less- something like MyList). After naming the channel list file scroll to and highlight OK on screen then press OK on remote. When you see COMPLETE on the screen you're done. Press EXIT and you will see that the backup Channel List bin is in the CH Data Backup file folder.
5. Removing card from 3500. WARNING! NEVER REMOVE SD CARD FROM 3500 WHILE YOU ARE STILL IN SD MEMORY ON 3500. EXIT ALL BEFORE REMOVING CARD.
6. You now have backup files you can now use at your discretion and at a latter date if the need arises.
B. USING A CARD READER TO CREATE BACKUP DATA
1. Place SD card in 3500.
2. Enter Menu, scroll down to SD memory, press OK. Files will have been created on the SD card but they will be empty (this formats the SD card).
3. Remove card from 3500.
WARNING! DO NOT REMOVE SD CARD FROM 3500 WHILE YOU ARE STILL IN SD MEMORY ON 3500. EXIT ALL BEFORE REMOVING.
4. Go to PC and place SD card in Card Reader.
5. Double click on My Computer and you will see Removable Disk H (could be some other letter besides H -depends on what letter your computer assigns to it).
6. Double click on Removable Disk (H) and you will see file folders have been created there but when you open them they will be empty.
7. Open the Code Backup file folder and drag the 118 (Test) bin from the file where you have stored it and drop it in the Code Backup folder.
8. Open the CH Data Backup file folder and drag your channel list from where you have stored it and drop in the CH Data Backup folder.
9. Make sure you shut down the Removable Disk (H) (with "Unplug or Eject Hardware" Icon Arrow in your PC Task bar) before removing SD card from card reader.
10. Place SD card in 3500. Access SD memory again and open either file and you will see that the bins you placed there are ready for you to load them to the 3500.