thanks, i managed to do it with meraki-cli https://github.com/PackeTsar/meraki-cli/blob/master/COMMAND_GUIDE.md with the following command:
meraki wireless updateNetworkWirelessSsid --organizationId XXXXXX --networkId 'N_XXXXXXXXXXXXXX' --number '14' --name 'XXXXXXXXXX' --enabled "true" --authMode 'psk' --encryptionMode 'wpa' --psk 'XXXXXXXX' --wpaEncryptionMode 'WPA2 only' --ipAssignmentMode 'Bridge mode' --useVlanTagging "true" --defaultVlanId "XXX" --visible "false"
I just copied this command in notepad and replayed the network-Id with the real ones and pasted all in the CLI. completed successfull to 130 networks even i guess there is a smarter solution with loops. overall i did in approx. 2 hours, by hand it would be 10hours (ish)