broose,
The "upgrade tool" is installed as part of the MP3 Player Utilities package. All manufacturers of MP3/MP4 players that use the ACTIONS chipset will provide that tool.
I don't recommend firmware upgrades to anyone. I mean, if you player is working fine, leave it. You can customise it with your own theme, but using someone else's firmware and upgrading the firmware if you player is already working normally, is something I don't recommend.
Due to the high risk of firmware upgrades and the possiblity that things can go wrong (ie: unplug during upgrade, upgrade with incorrect firmware etc), I think a company will be shooting themselves in the foot if they were to support firwmare upgrades 100%.
Unless they produce the firmware themselves and is ONLY specific for that player and no other firmware will work on it, then that might be ok. But these are generic players which use generic chip boards. Due to variations and customisation in firmwares by different manufacturers, there is an endless supply of different firmware which are most likely not compatible with all players.
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