# Unsuccesful migration from lte base shield ver2 to lte base hat

**URL:** <https://community.sixfab.com/t/unsuccesful-migration-from-lte-base-shield-ver2-to-lte-base-hat/126>\
**Category:** 3G/4G&LTE Base HAT\
**Created:** [March 3, 2020, 1:00pm UTC](https://community.sixfab.com/t/unsuccesful-migration-from-lte-base-shield-ver2-to-lte-base-hat/126 "2020-03-03T13:00:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mario.boulet](https://community.sixfab.com/letter_avatar_proxy/v4/letter/m/da6949/32.png) [@mario.boulet](https://community.sixfab.com/u/mario.boulet)\
**Post date:** [March 3, 2020, 1:00pm UTC](https://community.sixfab.com/t/unsuccesful-migration-from-lte-base-shield-ver2-to-lte-base-hat/126/1 "2020-03-03T13:00:15Z")

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Hi,  
I created a stack composed of a pi 4, a pijuice ups, an lte base shield ver2 and a cluster hat. Everything worked perfectly. Switching the lte module to the base hat, I get a message that cluster hat is not present.  
Trouble shooting, I tried the lte hat on usb only (hat not stacked with the rest) and all is working. I also tried with all the trace of the gpio’s cutted on the lte hat but it did not worked. I suspect something is wrong with the uart pins (trace not closed with weld).What else is different between lte hat and lte shield that could cause this issue?

Update:  
Chris from cluster Hat suggested a conflict between lte hat and cluster hat eeprom’s.

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**Author:** ![ensar](https://community.sixfab.com/user_avatar/community.sixfab.com/ensar/32/8_2.png) [@ensar](https://community.sixfab.com/u/ensar)\
**Post date:** [March 21, 2020, 2:49pm UTC](https://community.sixfab.com/t/unsuccesful-migration-from-lte-base-shield-ver2-to-lte-base-hat/126/2 "2020-03-21T14:49:53Z")

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Hi @mario.boulet,

As Chris says, a conflict occurs.  
They can work together, but one of the HATs cannot be detected.