I updated to the first version of v3 and haven't been able to apply any of the updates since.
I just tried upgrade v1 and upgrade v2 and the rc10c. All of them give me the "failed to unpack".
I just tried upgrading from v1 and v2 and it works perfectly fine, so not sure why it does that.
I am already on v3. But I want to upgrade to rc10c. I keep getting failed to unpack with all three bins provided in main post.
Yep, exactly the same here.
Well I have no clue why it works for some, but not for you guys, I'm sorry.

Feel free to send them my way if you want me to flash the V3c.