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When there is an activation error on your iPhone, you can try following solutions:
1. Restart iPhone
2. Start Over to Activate again
3. Check Network Connection
4. Check SIM Status
5. Use iTunes to Activate
6. Apply iOS System Recovery to Losslessly Repair

I use iMovie on my Mac as well. Meanwhile, I have a Joyoshare Video Rotator to professionally rotate my video left or right to 90°, 180°, 270° or 360° in high quality. Both are handy!

It seems that your iPad is stuck on DFU mode and cannot be boot normally to further enter recovery mode, right? I guess you can repair iOS system by FREE enter recovery mode using UltFix. It's worth a shot, no data loss at all. If it fails, further fix iOS to let your iPad normal. Or you can firstly...

Try possible solutions, like update iTunes to the latest version, change USB cable, check hardware issue. Or it's workable to repair iOS system and troubleshoot potential software error.

I have used an iPhone data recovery for PC to restore from my old iTunes backup. It amazingly supports encrypted backup files, which exactly what I like. Also, I tried its iCloud backup recovery and iOS device recovery modes, what are handy with real-time preview. If you just want to confirm whether...

Not sure whether there is something wrong with your iOS device. If you don't mind using an iOS system recovery to download, verify and unzip desired firmware package, you can have a further try. It allows downgrading or updating firmware and fixes possible errors.

Update or restore your iPhone device using iTunes or ask an iPhone system restore to fix possible software bugs and errors without damaging data.

From what you said, it seems there is no problem with the USB cable. I guess there are some bugs or glitches with the program after installation. If you'd like to find an alternative to fix your iPhone, Joyoshare iOS system recovery is worth a shot. I've already got that on my Windows and up to now,...

Would you like to switch your iPhone from DFU mode to Recovery mode? Give UltFix iOS System Recovery a shot here, which can Free and quickly boot your iPhone into Recovery mode using only one click. Also, it works to fix possible iPhone errors and bugs professionally with No data loss.

When there is an issue that iPhone shows a white Apple logo on screen, you are suggested to force restart, restore in Recovery or DFU mode, or fix with a Windows iPhone system recovery with zero data loss. One point to note is that it allows to free exit or enter recovery mode in one click.