Then this is most likely an hardware issue. You can try doing a software restore by performing a restore via iTunes.
You connect the iPhone 5C with iTunes opened on the computer then click on restore. You will lose all data when doing this so make sure you have backed up. If you decide to restore. Do not restore the backup just yet if you have made one. Test the bluetooth first then restore the backup. If the bluetooth doesn't work before restoring the backup then this is a hardware issue.
If the bluetooth breaks again after doing the backup restore then it is most likely corrupted settings from the backup you have made, which in this case do not use the backup and restore again without using it.
Can you turn on bluetooth at least?
Ben さんによる
Nope. even the Bluetooth cannot be turned on.
xnis さんによる
Then this is most likely an hardware issue. You can try doing a software restore by performing a restore via iTunes.
You connect the iPhone 5C with iTunes opened on the computer then click on restore. You will lose all data when doing this so make sure you have backed up. If you decide to restore. Do not restore the backup just yet if you have made one. Test the bluetooth first then restore the backup. If the bluetooth doesn't work before restoring the backup then this is a hardware issue.
If the bluetooth breaks again after doing the backup restore then it is most likely corrupted settings from the backup you have made, which in this case do not use the backup and restore again without using it.
Ben さんによる