Quote:
Originally Posted by ZTZ1010
I had this update done remotely by one of the more prominent coders (Henwee on IG). Took about an hour start to finish and cost about $180. I did full screen CarPlay separately myself. I have noticed incremental improvements similar to those OP described, but I can't say they have been as substantial in my eyes. Given the low cost, I'd still say it was worthwhile. Keep in mind if you're coded, you'll have to recode. My BM3 flash was unaffected.
I'd be hesitant to have the dealer do it if you're concerned about preserving OBD unlock capabilities unless you have a good relationship with your SA. I expect they will simultaneously update DME software (if you have an update) which means no more flashy flash.
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Unless a dealer chose to specifically do a full flash on the DME ( requires special authorization ), there's no way they will overwrite your DME software unless it was severely out of date to begin with pre 2020-march. Most cars got the 2020 march software due to the emissions recall from late 2019.
I used the same exact tools dealer does, hence why I'm confident.
Quote:
Originally Posted by strohw
I think you may be confusing how it works. The June 2020 encryption change for the Bosch ECU can not be unlocked. The ECU's prior to this do not get the updated encrypted boot loaders, they're just locked. Someone else can then unlock them again which means you have to go to a tuner or ship out your ECU. If a dealer update locked the ECU when it was originally unlocked then it can be unlocked again.
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Kind of correct.
There's 4 main layers in the DME.
Bosch/Infineon bootloader, can only be applied at the factory that makes the DME
BMW Bootloader, the bootloader that allows BMW tools to program the DME via OBD / dealer tools
DME Software
EEPROM data ( VIN, adaptations, mileage, runtime etc)
The BMW bootloader side, is what we talk about OBD lock, meaning the bootloader doesn't allow flashing modified DME software.. so far based on my data on my 2020 X3M, the bootloader is not locked.
On DME's that are manufactured after june 2020, there is a new Bosch/Infineon bootloader that is applied, that prevents people from flashing using bench tuner tools to flash a modified BMW bootloader that allows modified DME software to be flashed in via OBD after the fact.
Meaning they closed the one and only backdoor that allowed people to bench unlock the ECU, and also flash modified DME software over OBD.
For pre june 2020 cars, even on 2021 firmware, it doesn't appear they applied a OBD lock to the BMW bootloader/Software side, hence why I was able to keep my OBD unlock even after a full update using dealer tools.
Just a reminder for those on BM3, have them clear your account before you reflash your tune so you can have your OTS maps applied on the latest DME software.