RM500U-EA latest firmware request

Hi, is there any firmware for RM500U-EA? And guide on how to flash it?

Thanks

Dear @JsL
Please share your current firmware.
Which OS do you use?Windows or linux?

at+gmr
RM500UEAAAR03A06M2G_01.001.01.001

I’m on ubuntu Ubuntu 20.04.6 LTS.

Dear @JsL
RM500UEAAAR03A06M2G_01.001.01.001 is the latest one.

Can I reflash the firmware? because the current firmware is prevent me from changing or using other ISP sim. If possible can I get the firmware? And tools to reflash it?