Erased bootloaders, HID-bootloader missing

Context

Hi, for firmware debugging purposes I made the setup with efm32 starter kit + audiomoth that allow traces in simplicity studio with Simplicity Commander (see pictures bellow).

But I made a mistake, flashed a firmware a 0x0000 and erased the bootloaders.

Solution tried to restore the bootloader

Now I think found on github a binary of efm32 serial bootloader : https://github.com/im-tomu/toboot/tree/an0042/an0042_efm32 .

I flashed bootld.bin and it worked : it loads new firmwares properly flashed at 0x4000 !

Problem and can't restore HID-bootloader

But now I realize the missing piece is Audiomoth's HID-USB bootloader. I could flash it using EFM32WG starter kit, but I can't find it on your github.

I cannot use the FlashApp because it says : "Failed to switch audiomoth to flash mode". I suppose it is because it does not have HID-USB bootloader with flash mode.

You specify in the documentation that the FlashApp can communicate with original AN0042-bootloader and "update it". However, for me the FlashApp never detects AN0042-bootloader . I'm on Windows, I tried using paperclip and also flashing only AN0042-bootloader on the Audiomoth to be sure I was in the bootloader.

Questions

Do you confirm that I should be able use FlashApp to update AN0042 to audiomoth's HID-USB bootloader ? (Then it can be a problem with serial communication to AN0042).

Or can you give me a binary of the full bootloader so I can just flash it through simplicity commander ?

Thanks !

Louis