Hi DudaoRJ,
The symbols that are listed in the back-tester are determined by a MT4 file called “symbols.sel”. Usually this file is downloaded from your broker, however since you are disconnected it could be resulting in you having a stale list of symbols.
To resolve this, try placing the attached symbols.sel fil in the MT4 “history/ directory (Exit the MT4 application before doing this and backup the existing symbols.sel first). When you restart, it should have all the major pairs available.
Hope this helps.