Last month I have upgraded the firmware of my deco M4 (I have 3 units) to version Deco M4(EU)_V2_200628,

After I have made this I started to have connection problems to the mail server of my work. From time to time, my mail client was

not able to connect to the mail server of my work and it showed the following error:

Mail was unable to connect to server mail.ist using SSL on the default ports. Verify that this server supports SSL and that your account settings are correct.

This problem is not related to my computer since this also happens with another computer using a different version of the operating system.

And it seems that I am the only one having problems to access the mail server of my work.

How can I downgrade the firmware of my deco to check if this a problem of the deco or it is something else?

The web interface does not allow me to downgrade the firmware version!

Accessing the console, I can have the following extra messages that concern this problem:

error 17:04:18.128823+0100 Mail TCP Conn 0x600000c82580 SSLHandshake failed (-9806)

error 17:04:22.253165+0100 Mail nw_socket_handle_socket_event <private> Socket SO_ERROR [61: Connection refused]

error 17:04:22.253954+0100 Mail nw_connection_get_connected_socket [C514] Client called nw_connection_get_connected_socket on unconnected nw_connection

error 17:04:22.254056+0100 Mail TCP Conn 0x600000c3bcc0 Failed : error 0:61 [61]

error 17:04:36.538702+0100 Mail nw_socket_handle_socket_event <private> Socket SO_ERROR [54: Connection reset by peer]

error 17:04:36.570405+0100 Mail TCP Conn 0x600000c3bcc0 SSLHandshake failed (-9806)

error 17:04:36.634299+0100 Mail nw_socket_handle_socket_event <private> Socket SO_ERROR [61: Connection refused]

error 17:04:36.634959+0100 Mail nw_connection_get_connected_socket [C517] Client called nw_connection_get_connected_socket on unconnected nw_connection

error 17:04:36.636168+0100 Mail TCP Conn 0x600000ccfa80 Failed : error 0:61 [61]

error 17:04:48.537631+0100 Mail nw_socket_handle_socket_event <private> Socket SO_ERROR [54: Connection reset by peer]

error 17:04:48.572715+0100 Mail TCP Conn 0x600000c77780 SSLHandshake failed (-9806)

error 17:04:48.639933+0100 Mail nw_socket_handle_socket_event <private> Socket SO_ERROR [61: Connection refused]

error 17:04:48.641789+0100 Mail nw_connection_get_connected_socket [C520] Client called nw_connection_get_connected_socket on unconnected nw_connection

error 17:04:48.642009+0100 Mail TCP Conn 0x600000c767c0 Failed : error 0:61 [61]

Thanks.