You should not have done a factory reset as that will not help with anything. Factory reset will not reset anything related to Parameter settings it will only reset to default all settings in Device settings and Automation so EXT IOx and shunt values will be reset.
Also there is nothing wrong with the SBMS0 nor with the DEXT16 the problem is strictly your solar panel or the DSSR20
I see the DEXT16 red LED meaning that SBMS0 requests charging and DEXT16 has red LED ON meaning it is OK but the signal either is not getting to DSSR20 so check that remote wire from RCBatt to Batt and if that is OK then check your solar panel maybe some fuse or breaker if there is one between the panel/panels and DSSR20
I know you mentioned 37V from solar still there may not be any current and just a leakage to a damaged breaker or fuse if you have any.
Measure the RCBatt voltage but I assume that will be OK
I can not see in the photo if the DSSR20 LED is either green, red or just OFF. Eventually uninstall the DSSR20 and take a photo on the back of the DSSR20 (where the components are).