[timt976]

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First you need to Clear V850.
You're not able to downgrade it without clearing V850 first.

I think not needed so long as it’s not BTLD 7 or later.

Correct....

Dasi aka Kubax aka Bimmer-Remote.com , please tell us why he needs to clear V850?

Do not listen to this advice from Dasi, you are rolling dice clearing V850 when it's not required. Which in this instance it shouldn't be.

I downgrade EVO's daily on BTLD 6 or earlier, without ever clearing V850.

If your iD4 was flashed to iD5 properly , you will be on a BTLD older than 7 , so you can downgrade without Clearing V850.

Dasi is just another "expert" who clearly has no idea what he is doing.

NEVER CLEAR V850 UNLESS YOU ACTUALLY NEED TO.

Just because he has this in his signature , means nothing. 

"Full FSC Set + CarPlay Fullscreen - NBT EVO ID5/6(any software version)

EVO iDrive 4 to iDrive 6 FLASH including CarPlay Fullscreen
Retrofit FSC sets CIC / NBT / NBTEVO (ID4/5/6)
EVO Bootloader FIX / HW4.1 BTLD FIX / VO FIX / REGION CHANGE / BLACK SCREN FIX / CLEAR V850
KAFAS 2/4 SLI / MGU REGION CHANGE/CARPLAY / ENTRYNAV2 REGION CHANGE/CARPLAY" 


It's amazing how so many members of this forum have this ^^ or some variation of this in their signature and have absolutely no clue what they are doing