# Perfect Wave DAC II firmware upgrade problem

**URL:** <https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424>\
**Category:** DACs\
**Created:** [August 9, 2020, 5:11pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424 "2020-08-09T17:11:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![gfohler](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gfohler](https://forum.psaudio.com/u/gfohler)\
**Post date:** [August 9, 2020, 5:11pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424/1 "2020-08-09T17:11:42Z")

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Hi,  
had the DAC for a while now, love it. Only now found out the firmware can get upgraded. Tried today, seemed to upgrade (blinking blue), but now stuck at “Initializing”. Tried installing the oldest version I could find here (2.2.0), did not appear to upgrade (no blinking blue), but went straight to “Initializing”. I did see a bootrescue disk for another product, but could not find for mine.  
Any pointers or suggestions?

Thanks from Germany, Gerhard

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**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\
**Post date:** [August 10, 2020, 3:00pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424/2 "2020-08-10T15:00:54Z")

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Welcome! If I’m not mistaken, that can happen if the SD card is corrupt or isn’t in the correct format. Are you using a 2gb SD card?

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**Author:** ![gfohler](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gfohler](https://forum.psaudio.com/u/gfohler)\
**Post date:** [August 10, 2020, 7:43pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424/3 "2020-08-10T19:43:13Z")

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Hi,

thanks for the quick response! It is a 2GB SD card, formatted FAT32, I just run a test, the disk appears ok, I can read the files.

Gerhard

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**Author:** ![jamesh](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.psaudio.com/jamesh/32/3871_2.png) [@jamesh](https://forum.psaudio.com/u/jamesh)\
**Post date:** [August 10, 2020, 7:51pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424/4 "2020-08-10T19:51:57Z")

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That all sounds good. I just sent you an email with some files. Give them a shot and let me know if you have any luck.

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**Author:** ![gfohler](https://avatars.discourse-cdn.com/v4/letter/g/a3d4f5/32.png) [@gfohler](https://forum.psaudio.com/u/gfohler)\
**Post date:** [August 10, 2020, 8:13pm UTC](https://forum.psaudio.com/t/perfect-wave-dac-ii-firmware-upgrade-problem/18424/5 "2020-08-10T20:13:25Z")

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tried with a third SD Card, which worked, many thanks for the quick help!  
Gerhard