Unable to log into the admin page of my ReadyNAS 102 running 6:10:5

Hi I have a ReadyNAS 102 Model Name RN10200 Serial NUmber 3ERD53E400A2E  which is currently running ver 6.10.5 operating system.  I have installed two 3TB drives that are configured as a RAID 1 array.  I have it connected to my Huawei modem/router by cat5 ethernet cable.  I am connected to the Internet via the Australian iiNET ISP.

The router has allocated the internal ip address of 192.168.1.28.  My main desktop system is running Ubuntu 20.04LTS Linux.

I have been using it as a regular backup for my desktop and other systems that are also networked LAN on the same router.

I recently updated the NAS operating system to 6.10.5 and now I am now unable to access the Admin Page by which I control my backup jobs,  either by trying to directly log into 192.168.1.28 or by trying to log into it via my MyNetgear account.

• On attempting to log into the system I am presented with a pop-up asking for password and user name. 
• When this is submitted I am presented with a page that shows me the Admin Page briefly but then switches to another page informing me that it is
• "Connecting to the ReadyNAS Admin Page".    This appears to fail withou any error message and returns the pop-up request for user name and password.
• If this is resubmitted the system seems locked into a loop and repeats the process with the same result.
• If I cancel the process a page is shown suggesting a reset of the password using a straitened paperclip tool which resets the password to default "password".

As things stand I currently have the default admin and user set.  In this process I have already restored the whole system to factory setting using the recommended procedure from the user manual.   When this was first done I was able to access the Admin User page and set up a complete renewal of all my backup files.  Having done that I started a full backup process (which at the time of writing is still in process about 24 hours after initiation).  If I access the system through my MyNetgear logon  I can see that the backups are happening and can see the files that are backed up.

After initiating the fresh backup process I logged out of the system and out of MyNetgear.  When I tried to log back into the system the loop described above reocurred, effectively locking me out.

I would be very grateful for any advice you could give me.  I appreciate that as my device is 5 years old it no longer is in any way supported but apart from this problem it seems too good to trash.

Roger