Trying to find the correct firmware for an old RUT520
I do not have the original box. The sticker on the back of the router states: RUT 520 E01000
The current firmware is RUT5XX_T_01.00.488
According to this article https://wiki.teltonika-networks.com/view/Firmwares_for_Old_Devices
if firmware is x1xxxx, RUT500 x5xxxx and RUT500 x8xxxx use one firmware, if not use another
My question is, is E01000 the product code? Because if its is, its x1xxx (not x1xxxx).
If its not, how can i find the correct product code?