you can do it yourself. Try below guide iPhone 8 Battery Replacement

Try to flash with Z3X tool with 4 files

Hi dj holley, 1 ) Restore with iTunes after all data get backed up. 2) if searching issue exists after restore just check the IMEI (type *#06# on dialer ) 3) if IMEI status " null" definitely baseband chip issue. if IMEI number shows you need to check the TRX section of the logic board.

you need PC or MAC with internet connection to restore you iPhone

Hi Ijaz Press & hold the Volume down and Power keys on the device for 20 seconds

Hello danielle , it seems some issue occur of your firmware, 1) download smart switch 2) select emergency recovery & initialization where located at right side 3) put the phone to download mode by pressing and holding (simultaneously) the Power, Volume Down and Home buttons 4) select continue option 5) follow the instruction given by smart switch 6) Wait while process completed 7) you almost completed!!! Note : you have your own risk to do above steps!!! around 3GB-4GB of internet data will be required to download firmware. Hope this solution helps you to fix your phone.

Hi, Jasmine, simply you can use your Gmail ID and password to unlock your phone and you can setup new unlock pin or Patton as you wish

Hello Raageshwari , Simply you can do it your self, just connect your iPhone 5C to iTunes and get backup and restore it to iPhone 6+ . sim card is required for the carrier unlock not for the data transfer. Hope this answer help you to migrate your personal data and apps to iPhone 6+ :-)

Shahid Akbar, it's normal chemical reaction of the battery in -4C to 5 C. nothing to be worried about. :-) basic physics

Sara, Question is not clear enough to answer, anyway demo units comes with limited hardware and specially customized demo software. even demo units doesn't have radio network access baseband chip|Modem to access the radio networks such as 2G,3G,4G. you can only able to use WiFi. spending money to fix demo unit doesn't make any sense