so Im rooted. S-off. last night I installed skyraider 2.5.2 after that i installed radio 2.15. I was told i need an OTA file then re root. 2. things. I dont understand why I need the OTA file. and why cant i just load a different radio. like 2.05 while i was trying load the OTA file, im getting an error message. it wont load. its not double zipped. Ie: zip.zip any suggestions. I dont want a brick.