Pi 3B 2mic hat not recognized

[esmen2406]

Hello
I have a Raspberry pi 3b - Raspbian Stretch and a respeaker 2mic hat;
It was installed in accordance to the seeed get started process ( april 2019) and worked correctly.
Then after a halt or a reboot ( Don't know) it stopped to work.
There is no recognition of the mic and playback devices by the pi anymore.
Aplay detects only the audio system on the Pi and Arecord detects Nothing.
I update/upgrade the system and tried to re-install the pilots ( uninstall.sh; install.sh) but no improvement. Git clone didn't work as the seeed-voicecard directory already exists.
The leds and the button work correctly.
I saw in this forum that this problem is not knew and was corrected by reinstalling the system. It didn't work here; so may be I missed something or there is something else to do.
Any clue ?
Thanks

[bill.yu]

Hi there，

we build image with alexa/snowboy/drivers installed. you can download the 2018-08-06 image and burn to sd card. you can get the mics work directly. thanks.

https://v2.fangcloud.com/share/7395fd13 ... 13&lang=en