Depending from how your EA generates signals for specific symbol, you can try either use MT4Orders library and run your EA in MT5 tester or run tests one by one in MT4 tester and then combine reports with external tools (for example - this one of mine).
Aimak:
MT4 tester can only deal with one instrument, or cross how you name it. In real/demo trading MT4 can deal with multiple instruments.
If you want to backtest many instruments at the same time you must use MT5 which has a more advanced tester.
TANKS Aimak and Korotky, I think I don't have so many chances than migrating to MT5.
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Hallo, I have developed a multicross EA( It deals with 28 crosses) . I need backtesting on historical data series, but no way to perform it on MT4 platform. If I launch it I just get displayed the data related to one cross.
Does anybody know whether there are any solution on the web’? I read that MT5 could support multicross EA backtesting, but on the other side it is  not reliable MQL5