Not properly a day-to-day task...but an approach would be to see if it is possible to apply an ISSU procedure (where ISSU means In Service Software Upgrade, see just an example here), clearly after 6 years (so the system runs - from the software standpoint - as it started since 2011...isn't it?) there a lot of things to be verified before considering to proceed with an ISSU (if totally possible...consider there are a lot of different aspects that should be verified as preliminary steps...as example a stopper, years ago, was documented here...so, again, first you should understand where you are and what you have before planning any/arguing on step to be done).
I think an essential part is understanding Comware operating system versions status, IRF fabric configuration (Hw SKUs [*] & Sw versions)...as very preliminary steps...Hardware HP SKU will let you to understand what Comware version can run on installed MPUs (Main Processing Unit(s)) and the options you have (as example: just updating Comware 5 from a Release to a newer one, provided that you can perform it with the minimum possible downtime or no downtime at all, staying within the same Comware version).
[*] such old Hardware should the one that (a) since beginning supports Comware 5 only, (b) was - at some point after the initial installation - converted to support and be compatible with new Comware 7 (here) or (c) was already able to support Comware 7 (since 2012?).