I haven't been updating my car since I've tuned on BM3.
My curiosity is keeping the update log going, I'm wondering which ISTA version will be the last for the Supra.
xHP has it as an option for their transmission tune.
https://rbttuning.atlassian.net/wiki/spaces/RBTTUNING/pages/12058758/8-Speed+ZF+-+Flash+Settings#[hardBreak][hardBreak]Miscellaneous-Options
Otherwise need to dig around in the kombi settings in bimmercode.
Unlocked a few Supras through this DIY unit and flashed BM3 afterwards:
https://missiontuning.com/m-link-6/m-link.html
Unlimited unlocks if you want to keep iDrive updated.
Backups, recoveries, etcs.
Takes 10mins in the comfort of driveway/garage.
I usually update the iDrive version on the car...
Have some development here:
https://www.supramkv.com/threads/b58-air-to-oil-cooler-retrofit-from-m340i.15571/post-328959
Full kit:
https://dotekiautosolutions.com/products/b58-gen2-oil-cooler-kit-filter-relocation
The newer versions don't care as much, just clear codes before updating.
WiFi is optional I believe, only for FSC activation (adding/retrofitting functionality) and reporting.
Update process is all local to PC/Laptop.
Its S18T-23-11-542.
Specific one for Supras, latest and greatest:
https://www.toyota-tech.eu/DiagnosticTools/Software/ISTA
DIY installation guide:
https://www.supramkv.com/threads/any-interest-in-guide-to-doing-istep-update-yourself.13044/post-192797
Give the Enet cable a try, BMW ISTA should still work, some...
If they updated the ISTA/firmware, yes its going back to femto.
If they just performed the steering rack recalibration service function, no, the unlock/tune is untouched.
#3 in the diagram is the stock gasket, alot of aftermarket downpipes use this gasket.
I don't think this is the issue, shouldn't be a dramatic difference.
Example: