Will using ReiBoot to fix a bug, void my iPhone warranty?

Using ReiBoot to fix your iPhone won’t void your warranty. I’ve personally used it when my phone was stuck on the Apple logo during a restore process, and it worked perfectly! Later, my phone suffered a cracked screen, and when I took it to an Apple Service Center, they still honored the warranty. You can check the guide below：

Fix iPhone Stuck on Apple Logo 

Apple One (1) Year Limited Warranty For Apple Branded Products Only

Hi, I think you can try iTunes.

1. Connect your iPhone to a computer and open iTunes.
2. Put your iPhone into recovery mode:

• Press and release the volume up button, then the volume down button, and hold the side button until the recovery mode screen appears.

3. iTunes will detect your iPhone in recovery mode.

• First, select Update to try and fix the issue without erasing data.
• If that doesn’t work, select Restore, but note this will erase all data on the device.

Update software on iPhone, iPad or iPod touch in iTunes on PC - Apple Support (HK)

Restore your iPhone, iPad, or iPod to factory settings using a computer - Apple Support (HK)

I’ve tried ReiBoot before, and it works. However, I’d suggest trying iTunes or contacting Apple Support first.

See this article

If your iPhone is stuck on the Apple logo - Apple Support

Refer to this page for Apple Support features ➔ Contact - Official Apple Support

Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.

This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple for support and service - Apple Support For some countries look under “Other” listing at the end of each region. Not every country has telephone support.