[pshoey]

What procedure did you use to downgrade the boot loader?

The procedure is pretty straightforward:

Create a G11 FA with production date of 11/15.
Point E-Sys @ v3.56.5 pdszdata (others may work but this specific version worked for me).
Start E-Sys and connect as G11 series vehicle.
In TAL Calculating, load FA, read ECU and use usual procedure to calculate SVT and TAL. This should indicate that the HU will be flashed with v2 bootloader.
Save files and disconnect.
Re-connect to vehicle using appropriate vehicle model.
Load saved files and flash HU in normal manner.

Now HU should be back to V2 and you can use tool32 to clear SWT.