# WP77XX I2C Bus Issues Migrating from Rel14.1 to Rel15.1

**URL:** <https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582>\
**Category:** Uncategorized\
**Created:** [August 30, 2023, 3:12am UTC](https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582 "2023-08-30T03:12:11Z")\
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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [August 30, 2023, 4:02pm UTC](https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582/8 "2023-08-30T16:02:43Z")

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as you say that “make wp77xx” is working fine, how about adding your app to wifi.sdef and build the legato.cwe

> [@Flash size wp7607](https://forum.legato.io/t/flash-size-wp7607/3805/35):
>
> you can go to legato-19.02.0/modules/WiFi/wifi.sdef, under “apps:” section, add e.g. $LEGATO\_ROOT/apps/sample/helloWorld/helloWorld.adef [image] Now the new app will be included in legato.cwe. Please also note that the max size for legato partition is 8MB.

In this case, you don’t need to use mksys

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