That’s illegal under the Magnuson Moss Warranty Act.

Send them a certified letter. Inform them that they need to prove you caused the damage, repair or replace your device, or you’ll be taking them to arbitration.

They generally have to pay for the arbiter, so it’ll be cheaper to just replace your cheap phone even if they win.

It’s illegal for them to do that, BTW. They have to prove magisk damaged your battery.

I ran into this with Dell when they tried to claim after market RAM was the reason a CPU core wasn’t responding to interrupt requests.

All it took was asking for the diagnostic data showing that the aftermarket RAM caused it to get the warranty repair approved.

You just gotta push back until they cave. Maybe ask for their mailing address for your FTC report or for the number to their legal department (most call centers are terrified of escalating anything to the actual company).

But, don’t directly threaten legal action, because they’ll stop the call right there.

I fried the battery charging chip for my HTC dream when I rooted and used it as a router for the family in holiday. I felt it was hot to the touch but I thought “it’s gonna be ok, surely it has temperature sensors and it will throttle”. High draw for a long time when charging = the chip exploded and it wouldn’t charge anymore. Luckily the battery was removable and I already got an external charger for it from dealextreme. But HTC still repaired it for free under warranty even if it was my fault and I gave to them back rooted.

Same for LG when my rooted Nexus 5X boot looped, although that was an endemic problem caused by LG shitty manufacturing (they changed the stance a few months after that, never bought LG anymore)

Samsung should repair it, I thought they were the only ones root friendly left on the market…

While this is some bullshit companies pull, you don’t have third party repair companies in your area?

Fuck Samsung. Not surprised though