Hi there,
Seriously? 5.3.1 and comparing it to 5.2.13 when 5.4.4 is out?
I am really sorry, but I just cant understand why people are staying on old firmwares even if they face some issues. The update process is so easy in 5.x, when you have multiple partitions/RFDM upgrades via WAN links..
Accounts are being automatically purged on the latest firmware. Look at the date when this guide you are reading has been written, its from December 2012 (i.e. ~ 5.4.1 release).
btw, release notes (the ones you are getting with the download link) contain a lot of info regarding recent bug fixes for each release, so its worth to have a look at them.