### Author:  [@fakulatus](https://forum.sierrawireless.com/u/fakulatus)
#### Post date: [August 18, 2009, 2:49pm UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/1 "2009-08-18T14:49:24Z")
Hellow,
i’ve got a new Board with a Wavecom Q2686G and Firmware R73\_00gg
I’m programming and downloading with M2M Studio 1.0
I can connect to hardware without problems, to my AT-Commands it replays correct.
But if i try to download a new application (UART 1), it reports \*\*\* XMODEM ERROR \*\*\* and i have to shut off the cpu for several minutes bevor i can work again.
Any idea what the Problem can be?
Power Supply ?
Reset is on (high)
ON/OFF CPU is High
Boot is open (\
### Author:  [@paruthiv](https://forum.sierrawireless.com/u/paruthiv)
#### Post date: [August 19, 2009, 9:29am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/2 "2009-08-19T09:29:24Z")
Hi fakulatus
This error is normally received when we do not use the protocol as XModem or 1KX Modem while downloading the application… Also make sure you gave the “AT+WDWL” AT command before downloading the appli … 😃
hope this helps… 😒
Cheers,
Paruthiv
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### Author:  [@fakulatus](https://forum.sierrawireless.com/u/fakulatus)
#### Post date: [August 19, 2009, 10:47am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/3 "2009-08-19T10:47:55Z")
I tryed but failed ☹
don’t think that’s the Problem…
i do the same download prosedure as i’ve done with the wavecom demoboard…
Actually, i think it’s a boot-Problem or a power supply problem, i’ve got a bit more than 300mVpp because of the RS232-Transceivers (ADM3307) and with no idea how to eliminate it (allready patched a lot of C in) 👿
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### Author:  [@paruthiv](https://forum.sierrawireless.com/u/paruthiv)
#### Post date: [August 19, 2009, 12:46pm UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/4 "2009-08-19T12:46:03Z")
Why is the boot pin high ???
Boot pin should be on while downloading the firmware… Boot pin should be OFF while downloading an application…
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### Author:  [@fakulatus](https://forum.sierrawireless.com/u/fakulatus)
#### Post date: [August 19, 2009, 2:59pm UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/5 "2009-08-19T14:59:31Z")
i leave the boot-pin open, not connected to high or low
All data recive the wavecom well, but the q2686 don’t answer to the data-blocks (and begin to consume \>100mA)…
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### Author:  [@Madouc](https://forum.sierrawireless.com/u/Madouc)
#### Post date: [August 20, 2009, 9:38am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/6 "2009-08-20T09:38:21Z")
> [@paruthiv](#):
>
> Why is the boot pin high ???
>
> Boot pin should be on while downloading the firmware… Boot pin should be OFF while downloading an application…
use of the BOOT pin is only required when using WDLWIN.
you can load firmware and application into the processor with AT+WDWL. regardless of the BOOT-PIN setting.
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### Author:  [@fakulatus](https://forum.sierrawireless.com/u/fakulatus)
#### Post date: [August 21, 2009, 9:24am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/7 "2009-08-21T09:24:49Z")
The Boot-Pin was not the problem,
Problem was an undefinited output of the wavecom which disabled the Transreciver…
The only Problem left are the Trace, it still doesn’t work ☹
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### Author:  [@paruthiv](https://forum.sierrawireless.com/u/paruthiv)
#### Post date: [August 26, 2009, 8:24am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/8 "2009-08-26T08:24:38Z")
> [@](#):
>
> undefinited output of the wavecom
What do you mean by this…??
See if the AT commands are working correctly then ideally “AT+WDWL” command should also work correctly. Try changing the firmware… and check what is the downloader version by giving "AT+WDWL? … the downloader could be corrupted…
is the problem seen with only one application … I mean have you tried downloading a sample aplication first say “Hello World” …???
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### Author:  [@fakulatus](https://forum.sierrawireless.com/u/fakulatus)
#### Post date: [August 26, 2009, 11:35am UTC](https://forum.sierrawireless.com/t/xmodem-error/3569/9 "2009-08-26T11:35:34Z")
Everything’s fine now.
I had the enable of the transreciver on an “undefined by reset”-pin, so it toggled during the download of the Firmware