That's a bit light on info Mate, 'didn't work' is a tad genetic. However, a common problem is that an attempt to go directly back to the desired lower version fails with some units, Astro 320 is one such unit. When a progressive step-by-step to the next lowest is tried it will work. i.e. one at a time: 4.40>4.20>4.00>3.90>3.80>3.70>3.60>3.40. Read fully and then post again back in the following thread if you need more help: [Only registered and activated users can see links. ]. The problem was first noted going back from V3.70 to 3.40 as per [Only registered and activated users can see links. ] there.
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