This happened to me - see below:
https://www.supramkv.com/threads/bm3-customrom-is-ready.17785/page-7#post-281914
I ended up using my wifes laptop with BM3 installed on it and the proper connection cable.
I tried using my phone with usb to ethernet adapter and it failed while flashing - car...
I love it - power and sound.
I think the OEM exhaust with this is perfect. No droning on the freeway, but loud when you get on it.
I run every morning and lift weights and I always am so sore and bruised after laying on my back working on cars.....
Bought a Titan Catless Downpipe when I got the car in '21 and finally got around to installing it after getting the car tuned with BM3 CustomROM.
Also, changed the oil for the first time since I bought it new and got rid of the watery oil - oil only had 1800 miles on it and was nasty. I cut the...
When I flashed to BM3 CustomROM stage1 or stage2 this happened to me too.
The car does still burble here and there, but nothing like stock....and I'm catless too.
I think the only time I have spent 3-4 hours detailing a car was when I first get them - polish/jewel/ceramic coat.
About 15 years ago I stopped using a hose completely to wash my cars and use Optimum No Rinse Wash and Wax.
Takes me less than 15 minutes to wash/dry the car now.
While I was in Mexico, two weeks ago, going to check on my land, we pass by the BMW Factory that this M2 and the 3 Series are made in...its a huge city in the middle of nowhere - pretty cool.
JFC i'd be pissed if they added some crap like that.
Also, knowing how RO's are created at dealerships, I bet they didn't put anything in.
Change your own oil.