Where to find the firmwares of the FIMI X8 SE ?

Usualy, the update is performed by the FIMI APP.

However it is possible to perform one or several firmware update manualy with a SD Card.
The firmware of the FIMI X8 SE can be found from the following web page:
https://fimiservice-newus.mi-ae.com/v3/firmware/getFirmwareDetail

To do so, a tool has been developped by "David W." and is available on GitHub:
https://github.com/wladimir-computin/FimiX8-SDFG

Be aware that updating your drone manualy can make it unstable or unusable, due to the fact that each harware module has its own firmware update versioning and that compatibility dependancies may apply.