The problem I had of not receiving the preview channels was actually due to a defective card slot reader!! Luckily, the Ebay seller agreed to exchange the unit with another one. So far I've left the receiver on channel 100 (but powered off) for the past two days...no upgrade yet. In the meantime, I've emailed Directv support and asked when their next transmission of the upgrade is...I'll keep you posted.
Have you had any success with your TS160??
OTA HD setup: Harmony 659, Sony LCD GWII 60", Samsung SIR-TS160, CM 4228, CM 7775, CM 9521A