# Stuck at recvchannel.wait()

**URL:** <https://discuss.pynq.io/t/stuck-at-recvchannel-wait/2640>\
**Category:** Support\
**Created:** [May 11, 2021, 8:33am UTC](https://discuss.pynq.io/t/stuck-at-recvchannel-wait/2640 "2021-05-11T08:33:06Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\
**Post date:** [May 11, 2021, 10:19am UTC](https://discuss.pynq.io/t/stuck-at-recvchannel-wait/2640/3 "2021-05-11T10:19:06Z")

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Hi @sunwy,

Which pynq sdcard image version are you using?  
This may be related to this question

> [@Using AXI DMA on ZCU104](https://discuss.pynq.io/t/using-axi-dma-on-zcu104/779):
>
> I recently switch my works from PYNQ-Z2 to ZCU104. However, I get a problem on my first exercise, which is multiplying each elements in a given array by 3. I can receive the result, but it is incorrect. And any suggestion would be appreciated. My input is PynqBuffer([0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76], dtype=uint32) the expected output is multiplying each element by 3. However, the result I obtained is PynqBuffer([ 0, 0, 0, 0…

Mario

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