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It should be the ZF 6hp, so the only right fluid is its ZF Lifeguard, did you follow the fill procedure with inpa/ista that asks to fill at 35°C and 40°C?
There's this service bullettin from bmw regarding your particular error:
"SI B 24 04 07
Automatic Transmission April 2007
Technical Service
SUBJECT
ZF 6HP19TU in Failsafe Mode with Fault 4F8D Stored
MODEL
E90, E91, E92 with N52K or N54 engines and the 6HP19TU automatic transmission produced from 9/01/06 up to 2/28/2007
SITUATION
The transmission goes into failsafe mode with fault code 4F8D (ratio monitoring, gearshift 5-4 – plausibility) stored in the EGS.
CAUSE
EGS software diagnostics is too sensitive.
This fault may occur during a 5-4 downshift only in vehicles with either low mileage, a replacement transmission, or after a reset of the adaptation values.
CORRECTION
On a customer complaint basis only, perform an adaptation run as described in the procedure below.
Note: The transmission adaptation occurs only at a transmission oil temperature of 75°C or higher.
Once a transmission oil temperature of 75°C is reached, carry out the adaptation run as follows:
In drive position "D", increase vehicle speed up to 4th gear (approximately 25 mph), but do not allow a shift into 5th gear.
Allow the vehicle to then coast to a stop and keep the vehicle stationary for approximately 15 seconds with the brake pedal applied.
Next, with the vehicle stationary, change from D to N and back to D again.
Repeat steps 1 to 3 approximately 10 times.
This problem is solved in series production beginning 3/01/07 with integration level E89x-07-03-510.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code
24 00 23 83 00
Labor Operation:
24 99 000
Labor Allowance:
4 FRU
WT
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If this doesn't work I'd give a shot to new valvebody solenoids, as well as the 4 circular sleeves and the square one between said valvebody and the gearbox itself (and maybe a sonnax zip kit for your unit) before thinking about burned clutches or other internal damage... keep us updated!
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