ACER W4-821: its has gone after BIOS upgraiding

After upgraiding BIOS 1.13 to 1.16 on my ACER W4-821 on Windows 10 sound totally gone.

I reinstalled Windows 10 3 times (using different versions of Win: 240, 586, pre-release) but the sound is not spend on, so the problem is not related to Windows 10...

How can I downgrade my BIOS to 1.13? Is - this any legal way to do so?

Thank you in advance!

I suddenly have to solve the problem by testing different drivers for Intel ESS Audio Device (WDM).

The only pilot functional (among 5, including later)-603.9600.1948.25487, 30.09.2013

Tags: Acer Tablets

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