Here's a reference from Cellmicro on How To fix iPhone 6 Clone Phone Service Stop Error. The only solution for this is to flash with iphone6 stock ROM that can be downloaded on needrom.com. The procedures are very easy. See the screenshots below. tested by cellmicro.
Read info first via SRS to be able to know the board id. Then search for the compatible firmware. Use spflashtool to flash the phone/
Read info first via SRS to be able to know the board id. Then search for the compatible firmware. Use spflashtool to flash the phone/