So, open Clover Configurator and go in HEX Converter and type BRT6 into the second filed (TEXT to HEX) as in figure:
View attachment 418959
and repeat the same step for BRTX.
Then go in ACPI section and add a new entry "Rename BRT6 to BRTX" and add the HEX values that you obtained before.
P.S. If you take the Find value of "GFX0 to IGPU" and try to decode it with HEX->text you'll see GFX0 written in HEX.
N.B. If you want to apply a rename on a DSDT (for example EC0 to EC) you have to add as many _ as are the remaining chars.
EC0 will be written inside text <-> HEX as EC0_
EC will be written inside text <-> HEX as EC__
I hope you fixed this