I just got a new notification to update my ROM to the new version ROW_S221_150119. The complete name of the update is S920_ROW_S220_140722_TO_ROW_S221_150119. The size of the update is 223 MB, but it’s not clear what features it includes.
The update says:
1. This update will not erase data. However, please backup important data to avoid data loss due to update failure!
2. To avoid update failure, please stay on the current interface during firmware download, maintain the network connection, and ensure sufficient battery life.
This firmware upgrade will fix bugs and increase device stability.”
I haven’t been able to find the list of the fixed bugs.