Hi all, I want to share a working upgrade path for CCR2004 routers that fail upgrading from older RouterOS 7 versions with this error: upgrade failed, free XXX kB disk space for a (null)upgrade (example: free 297 kB) Important: This is not a normal “delete files / remove packages” issue. If you…

[image] Upgrading CCR2004 General Hi there, I have a few CCR2004 with the following resources available: > sys resource/pr uptime: 1m59s version: 7.12.1 (stable) build-time: Nov/17/2023 11:38:45 fac…

Doesn't work for me went back to 7.13.4 -> 7.16.2 -> 7.18.2 ->(tried) 7.21, fails with log: ""upgrade failed, free 165 kB of kernel disk space""

Hmm. Officially the change to increase the reserved space for the kernel is in 7.18. The only thing I can imagine is that maybe an extra reboot would be needed? Netinstall?

Following up, no ammount of reboots(keeping the same version), nor going back to 7.18 -> 7.18.1 -> 7.18.2 -> 7.{19,20,21} worked for me Those will have to be removed from production (to allow for a netinstall)

I was stuck on 7.16.2, receiving an error like yours. Try doing /system/routerboard/upgrade prior to upgrading to 7.18.2. It worked for me. Just upgraded to 7.21.1 with no problems. Thanks RcRaCk2k!

I am also seeing the same behaviour where no amount of reboots/different versions/automatic vs local upgrades is allowing me to get past 7.18.2. I keep seeing “upgrade failed, free 177 kB of kernel disk space”

We are now in the process of upgrading a fleet of 2004s from the last 6.49 to 7.21/7.22. They’re all in production and scattered around, some in hard to reach sites. The process involves: applying a few safeguards in order to preserve minimal connectivity uploading a new configuration script (upg…

Just had this issue with RB450Gx4 My Path was 6.47.x (i want to say 6) 7.12.1 7.22 (failed) 7.16.2 7.22 (failed) 7.18.2 (overnight - caused hotspot issue) 7.22 (failed) 7.20.8 7.22 (complete) over 18/3/26-19/3/26 my error stated "21kb of kernel space" after 7.16.2 and "21kB disk space" f…

Thanks Man :slight_smile: you help me alot to upgrade first production of ccr 2004

I found this thread after being unable to upgrade my CCR2004 beyond 7.12.1, after starting today with version 7.5. I was able to upgrade to 7.22.2 successfully through several version hops and wanted to share my notes here in case it helps someone else. CCR2004-1G-12S+2XS upgrade path to 7.22.2 — o…

CCR2004 upgrade failed “free XXX kB disk space for a (null)upgrade” – working upgrade path to 7.21

RouterOS General

Kanta January 18, 2026, 12:13pm 2