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Help! Firmware update

Can anybody point me in the right direction, I recently purchased a secondhand frsky x12s which the previous owner had flashed to open tx but at my request had flashed back to FROS which is about 5 updates out of date so i need to update it now bearing in mind computers are almost a foreign language can anybody point me to a idiots guide to updating the firmware i am a UK resident so model shops are few and far away.