There is anecdotal evidence (and some verified syslogs) suggesting that C5cs running firmware 281 have longer uptimes. One operator reported a C5c on a mountain top running version 281 with an uptime of 847 days. Newer versions, which auto-reboot for "memory optimization" after 30-60 days, do not offer this level of carrier-grade stability.
If your C5c is currently on an earlier version (like 1.x or 2.0.x) and connected to the internet: mimosa c5c firmware 281 download better
In later firmware versions (specifically 2.5.0 and above), users reported that the Automatic Transmit Power Control (ATPC) became overly aggressive. In high-interference environments (urban deployments), newer firmware would drop MCS rates too quickly to maintain a "clean" signal. Version 281 adheres to a looser, faster link adaptation algorithm. This results in higher throughput at the edge of the cell, even if the signal-to-noise ratio (SNR) fluctuates by 3-5dB. There is anecdotal evidence (and some verified syslogs)