# Boot Loader Menu appearing in S2C serial data

**URL:** <https://forums.digi.com/t/boot-loader-menu-appearing-in-s2c-serial-data/17090>\
**Category:** XBee & XBee Gateway\
**Tags:** bootloader, s2c, xbee\
**Created:** [July 15, 2016, 10:19am UTC](https://forums.digi.com/t/boot-loader-menu-appearing-in-s2c-serial-data/17090 "2016-07-15T10:19:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![adunker](https://avatars.discourse-cdn.com/v4/letter/a/b9bd4f/32.png) [@adunker](https://forums.digi.com/u/adunker)\
**Post date:** [July 15, 2016, 10:19am UTC](https://forums.digi.com/t/boot-loader-menu-appearing-in-s2c-serial-data/17090/1 "2016-07-15T10:19:09Z")

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So I have four Zigbee S2C’s and have been having some strange trouble with them. I was working with an Arduino Uno and using AltSoftSerial, and with a simple code setup that just dumps serial data back and forth, the Boot Loader menu seems to be getting pulled up, and I have no idea why.

.B-Bypass  
.F-Update App  
.T-Timeout  
.V-BL Ver.  
.A-App Ver.  
.R-Reset

This will appear in the serial data, and I believe it’s causing my problems with the serial data.

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**Author:** ![asgm](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/asgm/32/3688_2.png) [@asgm](https://forums.digi.com/u/asgm)\
**Post date:** [July 18, 2016, 2:48am UTC](https://forums.digi.com/t/boot-loader-menu-appearing-in-s2c-serial-data/17090/2 "2016-07-18T02:48:41Z")

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That’s bootloader menu of programmable XBee (MCU+XBee). Press “B” to bypass MCU and then you will have direct access to XBee’s radio.