Upgrade MR2200AC to SRM 1.3.1-9346 (from SRM 1.2.5-8227 Update 8)

[Enquiries]

Dear NAS Compares, I have a synology MR2200AC router, and a second MR2200AC connected as a mesh router. CONTROL PANEL--SYSTEM indicates that my SRM version is SRM 1.2.5-8227 Update 8, and that my "SRM version is up-to-date". I think I can manually update the router by going to synology Download Center (https://www.synology.com/en-global/support/download/MR2200ac?version=1.3#system), and installing two patches to get the 1.3.1-9346 upgrade. I see how to do this for the main router by going into CONTROL PANEL--SYSTEM--MANUAL SRM Update. I assume that both the main router and the second/mesh router need to be running the same SRM. How to I updated the second/mesh router to SRM 1.3.1-9346...? Thanks in advance for any help that you can provide... James