Hi, I am having issues with iMessages. I don't get texts from certain contacts that also have iphones , or I get the texts 30mins-1hr later and all at once, so like 3-4 texts in a row. What is causing this issue? I have reset all my settings, erased my phone, done everything. I even switched carriers, had Verizon and a 5c, switched to AT&T and a 5s last week. The contacts either get my texts, or I don't get theirs. What can I do? I am out of ideas, this is getting frustrated. Also, how do I go back to iOS 8.1, I updated to 8.11, and I tried to get the 8.1 firmware but it downloaded in a .dmg file, and I couldn't convert it . Or when I would change the filename to .IPSW and then restore through iTunes, and I would get the Not compatible error.