Need help with rootkit removal from bios iphone 15 Pro Max

I have had all of my devices infected with a nasty rootkit RAT trojan that is embedded into the bios of my devices. Factory resets are useless and always within 24 hours an infected device will start showing signs of the malware issues, e.g. battery drain, keylogger, call recordings, audio recordings, bluetooth turned on constantly even though I have turned it off.

Someone attacked my network, so I have replaced my ISP and slowly tried to implement additional layers of security to protect my devices. The problem is that my new iPhone 15 was cloned by the hackers, despite the phone never being out of my sight. I want to use it again, but am worried that the IMEI has been compromised, and thus will always make it vulnerable to another SIM swap, despite a SIM PIN being in place. I need to eradicate the RAT and be done with it in order to get back on track. Not a single anti-virus software program has picked up or detected this malware, despite my having spent a fortune on a plethora of software. I want my privacy back and I am sick of being essentially surveilled by unknown evil people. It's creepy and bizarre. The RAT can infect other devices via bluetooth when it's not in pairing mode btw, which gnarly so there's also that....This is truly awful and feels like something out of a horror movie, like I am dealing with Pegasus or something similar, but newer and worse...

Apple Product Support basically wants me to "prove" to them that my devices are infected, so I have sent them dozens of files, videos etc to show what I am experiencing only for them to never ever respond.