I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/message/10363#10363
Come back if it that doesn't help either.
Hi, I'm using an M1 on an over the air panasonic 50 inch plasma tv model number TH-50PE8U. The remote is a N2QAYB000221. I tried the only N2QAYB... remote in the list but it didn't work, also tried all the "other" codes, the universal remote, and several others to no avail. I also went through all of the steps on "Read this first if you have an issue with the on screen remote control". If you have any other suggestions of remotes that might work let me know! Thanks.