Geeetech A20T + BL Touch on Marlin 2.0.x: G29 auto bed leveling doesnt work

[Tobi_T]

Hello,
I have a Geeetech A20T with an installed BLTouch V3.1.
I updated the Firmware to Vertabreaker's Marlin 2.0.x Build. (BLTouch enabled)

Regarding the description of BLTouch I have to add the following code to the startcode:

M280 P0 S160 ; BLTouch alarm release
G4 P100 ; delay for BLTouch
G28 ; home
G29 ; auto bed leveling

The first three do there work, but the command "G29" only generates a short "beep" on the speaker and noting more happens.
What do I have to do to make a auto bed leveling?

Thanks Tobi

[Hopsing]

Tobi;

Did you get the auto bed leveling to work? If so where might one fine the configuration.h file and will it work on a older GT2560 V3 board?