It looks like your download.gl-inet.com site only uses insecure http, not https?
It appears to be the only way to download the Beta firmware that supports Esim configuration?
Could you please enable HTTPS for your download site?
You can download the firmware here: https://dl.gl-inet.com
I don’t see the Beta version of the ESIM firmware for XE300 / Puli though?
Here you go:
https://fw.gl-inet.com/firmware/xe300/esim/openwrt-xe300-4.3.23-1107-1730944851.img