No more connection to older RepetierServer image

Abt

I tried to re-activate a RepetiereServer on a respberry pi 3 A+
Do not know which version, the download link of the purchase lead me to Repetier-Server_1_3_0b.zip.

The raspberry boots, but does not connect to a WiFi. Maybe I changed the WiFi name ... do not remember.
I can see the accesspoint of the raspberry, but when connecting with my phone, it does not get an IP address from the DHCP.
When setting it up for a fixed IP with 10.10.10.50 as own adress, 1010.10.1 as gateway and DNS and 24 as subnet, I got connected, but cannot connect to 10.10.10.1:3344 or anything.

I connected a monitor via HDMI, a mouse and a keyboard and I can see that it boots into the touchscreen interface of RepetierServer.

I cannot press escape during bootup to see a shell output.
I can't do anything with the keyboard, except Alt+Tab, which changes tasks, but RepetierServer is the only one.
I do not habe a mouse pointer, but when moving the mouse I get rarely mostly the most right symbol to change color. And this is "Shutdown". I did geht some other things, like changing the language, but I do not get the settings to access the network settings.
I am tryinfg for hours without a mouse pointer...

I tried to manipulate the files of the FAT32 partition wpa_supplicant.conf an repetier-serup.txt.
I set the WPA security to 1 and later to 0, but had no luck getting an IP (As I mentioned, connecting with own fixed IP happened, but no connection to repetierserver on 10.10.10.1 Maybe it is set to another IP.)

I put the correct country shortcut, WiFI Name and the password into wpa_supplicant.conf on the FAT32 partition, but no luck.
How does the image handle these two versions? Will the FAT32 versions of those files be copied over the linux files when booting?

I also tried it putting it into this file of the linux partition but had no read permission on a linux PC. Need to retry with sudo nano.

The server is running as I can see on the directly connected monitor, but I do not get a connection.
Where in the linux system can I look to see, what it tries to connect? In the wpa_supplicant.conf?
Where would I find an fixed IP setting in the linux filesystem?

I am thinking to setup a new image, but the one license of repetierServer would be lost and I have to setup many things.
On the FAT32 partition there is a backup folder and there are some backup files on the root. Can I use these on a new server setup to get my printer settings back?

Burt first I would like to connect directly to the accesspoint with my phone and setup a new WiFI...

Repetier

Actually hard to say also after so many changes and with an apperently old image. Wifi changed over time so not all images use it the same way especially since pi foundation switched wifi management solution. See
https://www.repetier-server.com/knowledgebase/wlan-configuration-on-sd-card/
for solution that work on different images. Note that once you overwrite config the server will not handle ap/wlan switch any more.

Easiest solution would be in deed switching to a new image on a new sd card. Then you can put a sd card reader with old sd card to pi so you get access to old image. All configs are stored in /var/lib/Repetier-Server. Login with ssh, shutdown server (sudo service RepetierServer stop) and copy folder to new image and reboot. All printers and printer configs should then be there including activation. reboot and all should work if network was already configured. This gives you an updated image and solves problem normally quicker then anything else.