flycast_libretro doesn't work?

Hi, I'm using Trimui Smart Pro S. With the original firmware version 1.0.1. I would like to use RetroAchievements, IA Services and border overlays but theflycast_li6bretro doesn't work and the games only run in the standalone flycast emulator. I checked the BIOS: dc_boot.bin, dc_bios.bin and dc_flash.bin are in /retroarch/system/dc together with 8 vmu_save_??.bin files. I checked RetroArch does use GL backend for vídeo. The games are in CHD format that I converted myself. I could run those games perfectly on RHCubeXX and are working on Windows. Does anyone have any ideas what else I can try?