There are several solutions to consider:
1. Use currently installed Mobile Joomla! Pro 1.2.x and renew subscription to Mobile Joomla Pro to get access remote device database.
2. Use 1.2.x and wait for MJ 2.1.26 release, then try to extract AMDD database and files from new release and apply them to currently installed 1.2.x. I've never tried this way, but it should be possible.
3. Update to MJ 2.1.26 after it will be released, but note that MJ 2.x uses another preinstalled template (modern Mobile_Basic instead of "ancient" mobile_xhtml and mobile_iphone), so it is necessary to test a copy of your website with MJ 2.x before installing it on live website.
4. If you will choose to switch to MJ 2.x branch, consider to use Mobile Joomla! Pro 2.x as well to use remote device database.
PS. Could you PM me URL of your website? I'll open you temporary access to remote device database to be sure it works.