# Pynq-z2 upload overlay connect time out
**URL:** https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408
**Category:** Support
**Created:** [June 30, 2022, 3:03pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408 "2022-06-30T15:03:10Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [June 30, 2022, 3:03pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/1 "2022-06-30T15:03:11Z")
Hi all, I have get the ‘cnn.bit’ file, but when I upload it, it always tell me connected time out.
Here is the question picture. Does anyone know how to fix this, thanks in advance.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [June 30, 2022, 4:00pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/2 "2022-06-30T16:00:21Z")
Hi,
Are you able to download other bitstream? The base overlay for instance.
Mario
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [June 30, 2022, 4:18pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/3 "2022-06-30T16:18:46Z")
Yes, I can.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [June 30, 2022, 4:51pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/4 "2022-06-30T16:51:04Z")
Can you please try to run the cell multiple times?
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [June 30, 2022, 6:57pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/5 "2022-06-30T18:57:55Z")
I’m new to this and don’t really understand it, can you tell me how to do it, or what code should be run?
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [June 30, 2022, 7:22pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/6 "2022-06-30T19:22:04Z")
Hi,
Simply re execute the same cell a few times and let me know if you are successful in any of the executions.
Mario
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [June 30, 2022, 7:42pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/7 "2022-06-30T19:42:52Z")
I have run 10 times, and all times is succeed.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [July 2, 2022, 8:52am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/8 "2022-07-02T08:52:11Z")
Can you please do the same for the `cnn.bit`?
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [July 3, 2022, 6:47pm UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/9 "2022-07-03T18:47:28Z")
I have try, but it show me the same error.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [July 4, 2022, 7:42am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/10 "2022-07-04T07:42:04Z")
Is it possible for you to share the `cnn.bit` and `cnn.hwh`?
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [July 4, 2022, 9:37am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/11 "2022-07-04T09:37:14Z")
I have download it from this website.
> **[GitHub - briansune/PYNQ-2.7-MNIST: PYNQ-Based MNIST with Tensorflow Lite](https://github.com/briansune/PYNQ-2.7-MNIST)**
>
> PYNQ-Based MNIST with Tensorflow Lite . Contribute to briansune/PYNQ-2.7-MNIST development by creating an account on GitHub.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [July 4, 2022, 9:53am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/12 "2022-07-04T09:53:45Z")
Hi @376197315,
According to the hwh file, the bitstream is targeting a 7010 device, which is not the same device as the PYNQ-Z2. Hence, the reason of failure.
>
@briansune what board is the bitstream targeting? Could you please add it to the README?
Mario
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### Author:  [@briansune](https://discuss.pynq.io/u/briansune)
#### Post date: [July 4, 2022, 10:27am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/13 "2022-07-04T10:27:01Z")
@marioruiz
First I am sorry about developers don’t check before use (there are no directly said it is targeted for PYNQ-Z2) but I had given a resources usage table.
I will always expect people to recompile on their working environment.
> **[GitHub - briansune/PYNQ-2.7-MNIST: PYNQ-Based MNIST with Tensorflow Lite](https://github.com/briansune/PYNQ-2.7-MNIST#vivado-resource-usage)**
>
> PYNQ-Based MNIST with Tensorflow Lite . Contribute to briansune/PYNQ-2.7-MNIST development by creating an account on GitHub.
> I will add a Highlight about the chip info this is targeting.
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [July 4, 2022, 10:30am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/14 "2022-07-04T10:30:03Z")
Hi @briansune,
For people without much experience a resources table doesn’t say much. It would be best explicitly say what platform is supported to avoid confusion.
Mario
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### Author:  [@briansune](https://discuss.pynq.io/u/briansune)
#### Post date: [July 4, 2022, 10:32am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/15 "2022-07-04T10:32:06Z")
Hi @marioruiz
True, I guess the chip info is more than enough as even it is on a different board as long as the chip is the same (excluding the speed grade) as -1 to -3 is just the timing stuff.
So this is universal enough.
Correct me if this is still not good enough.
Thank you
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### Author:  [@marioruiz](https://discuss.pynq.io/u/marioruiz)
#### Post date: [July 4, 2022, 10:36am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/16 "2022-07-04T10:36:55Z")
I would suggest that you add custom board next to the device so as to avoid any confusion.
Thank you.
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### Author:  [@376197315](https://discuss.pynq.io/u/376197315)
#### Post date: [July 4, 2022, 11:14am UTC](https://discuss.pynq.io/t/pynq-z2-upload-overlay-connect-time-out/4408/17 "2022-07-04T11:14:40Z")
Thank you for your help.