# "Got invalid impossible slope calibration!" with G6 and xDrip+, can't calibrate...what to do? **URL:** \ **Category:** Tips, Tech & Gear\ **Tags:** xdrip\ **Created:** [November 6, 2019, 7:00am UTC](https://forum.fudiabetes.org/t/got-invalid-impossible-slope-calibration-with-g6-and-xdrip-cant-calibrate-what-to-do/8622 "2019-11-06T07:00:48Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![MM2](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/mm2/32/3032_2.png) [@MM2](https://forum.fudiabetes.org/u/MM2)\ **Post date:** [November 6, 2019, 4:36pm UTC](https://forum.fudiabetes.org/t/got-invalid-impossible-slope-calibration-with-g6-and-xdrip-cant-calibrate-what-to-do/8622/2 "2019-11-06T16:36:38Z")
This prior post may help. > [@Can't calibrate xDrip+ anymore](https://forum.fudiabetes.org/t/cant-calibrate-xdrip-anymore/6198): > > Sorry for all the posts – I’m still getting used to xDrip and working through issues with it. Today I felt that the readings were off so I calibrated it with BG readings from my Freestyle Lite (the readings were indeed about 25 off), but got this message on xDrip+: “Sensor raw data sanity failure”, and nothing changed with the reading on xDrip. I tried it multiple times and also did the “override calibration” thing, which gave me the same result. I had to do the day before yesterday as well whe… --- _[View the full topic](https://forum.fudiabetes.org/t/got-invalid-impossible-slope-calibration-with-g6-and-xdrip-cant-calibrate-what-to-do/8622)._