Step #3: Scroll down and tap “ Transfer or Reset iPhone”.Step #1: Open the “Settings” app on your iPhone.If you are performing Factory Reset on your iPhone, then kindly backup your iPhone to prevent data loss. Corrupted software, to fix this you must have Erase All Contents & Settings of your iPhone 13 Pro Max.Frequent water damage can also result in such issues.The USB port of a PC or Mac might be causing that continuous beeping sound on iPhone 13 Pro Max.Other Possibilities why My iPhone 13 Pro Max keeps beeping while trying to charge or connecting to PC or Mac. They will perfectly examine your iPhone 13 Pro Max and bring you a quick solution. If it continues to give you bother a trip to the Apple Store might be worth it.I think the issue has gone wild, now we have one last option that is to contact Apple Support. Took too long typing Glad it's back in a working state, could still be worth an SMC/PRAM reset though. If you're still in AppleCare you should take a run to the Glasgow Apple Store anyway, get them to sort it out. I'm running out of things to suggest Tried booting on battery only Try booting with the hard drive out (since you say you've had hard drive problems before).

Do a PRAM reset and an SMC reset just to be sure (can't hurt). Give it a good blow and put it all back in. Take your battery out, take your hard drive out, take your RAM out. The kernel panics and freezing could be down to dodgy RAM, even though your beeps aren't complaining about the RAM. Shine, it's beeping SOS (short-long-short) not OSO (long-short-long) as the article suggests (which just means the article is wrong chances are the guy who wrote it didn't know his morse code), and the screen that shows up briefly definitely looks like a firmware update screen, so I think you're right.

Macbook pro 3 beeps after startup chime