Ref.: #34248
Background/Details:
In firmware 8.5.2 GA, if the router’s Cellular setting has enabled the “Reserve for management traffic when usage hits 100% of monthly allowance” option on a particular SIM slot, it should remain in that “management traffic” only SIM for about 30 minutes before failing over to another available SIM.
However, due to the known issue, you will notice a constant SIM switching event on average every 5 minutes, and the router is unable to establish a data connection.
A special firmware 8.5.2s046 has fixed the issue, and it is included in the 8.5.3 GA firmware release.
Affected firmware version:
8.5.2 GA
Affected models:
Balance: 20X, 30 LTE/Pro, 310 5G/Fiber 5G, 310X, 380X, 580X
MAX: BR1/2, HD1/2/4, Transit, HD2/4 MBX, MBX Mini
B One: B One 5G/Plus
MediaFast: HD2/4
UBR: Plus
PDX, SDX, SDX Pro, EPX
Fixed in firmware version:
8.5.2s046