Sounds like several issues posted here. Last year my issue was after an update the SG200 screen would say initializing, then go blank. Tried several things but still had the same result.
Talked to Balmar at the Annapolis show last fall. He stressed the order of updating devices was important and pointed me to this link,
SG200 FAQ which says:
My SG200 won't update or when it does it gives me erroneous data. What do I do next?
The SG200 firmware update routine requires a very specific protocol. Please conduct the following steps: 1) Ensure that you have the latest software update from the Google Store or iPhone Store. 2) Shut down the APP on you phone. 3) Pull the fuse on the red power wire to the SmartShunt, wait 5 seconds, then replace the fuse 4) After the Display comes back on, conduct a Network Reset from the Display, then check for devices to be sure that every device is present. 5) Proactively “kill” the APP on your phone, then restart the APP. 6) Try the update process again, using only the phone APP. Use the following device update sequence: a. Update Bluetooth (You must do this FIRST!!) b. Update Display c. Update SmartShunt and Battery Chemistries 7) Once the update is complete, then reset the Battery Type and and Capacity. This will load in the latest Battery Chemistry contained in the update. 8) You may need to pull the fuse between device upgrades, although a network reset is often enough. If you cannot update no matter what you try, consider running a XECHO test between the Display and SmartShunt, and/or move the Buetooth Gateway to plug directly into the SmartShunt.
This solved my issue.