# Can an 81xxxx Dexcom Transmitter with 1.6.5.27 firmware be reset? **URL:** \ **Category:** C/GM\ **Created:** [November 18, 2019, 6:08pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704 "2019-11-18T18:08:33Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![Toni](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/toni/32/7583_2.png) [@Toni](https://forum.fudiabetes.org/u/Toni)\ **Post date:** [November 18, 2019, 6:08pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/1 "2019-11-18T18:08:33Z")
Just an FYI for anyone searching on how to reset the days since activation to zero on the Dexcom 81xxxx transmitter with 1.6.5.27 software. My experience is that it currently (Nov 18,2019) cannot be reset. I’ve been working on this for 2 weeks with a lot of help from this forum and other forums. I have not been successful. I have tried the following apps: –Reset App –XDrip Plus –Spike-App With each app I have attempted to reset multiple times (I didn’t keep count but at least 5 times each app). I have found 2 people on another forum that think it has similar firmware to the Firefly transmitter and both say they do not think it can be reset. OK, now you know everything I know about it. If you have had success resetting this transmitter/firmware combo, please share your method. ---
**Author:** ![Chris](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/chris/32/382_2.png) [@Chris](https://forum.fudiabetes.org/u/Chris)\ **Post date:** [November 20, 2019, 12:11am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/2 "2019-11-20T00:11:26Z")
33 posts were split to a new topic: [Sensor and Fraud Discussion](https://forum.fudiabetes.org/t/sensor-and-fraud-discussion/8711) ---
**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 18, 2019, 10:06pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/8 "2019-11-18T22:06:46Z")
> [@Sensor and Fraud Discussion](https://forum.fudiabetes.org/t/sensor-and-fraud-discussion/8711/3): > > And I know of one person who restarted the first 8H sensor he tried… so at least there’s that? The original post is about resetting transmitter days, not restarting sensors. I have 81xx with firmware 1.6.5.25, and will attempt reset in about 60 days. ---
**Author:** ![Thomas](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/thomas/32/1719_2.png) [@Thomas](https://forum.fudiabetes.org/u/Thomas)\ **Post date:** [November 19, 2019, 12:01am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/17 "2019-11-19T00:01:45Z")
> [@Toni](#): > > Dexcom 81xxxx transmitter with 1.6.5.27 software. > [@MM2](#): > > I have 81xx with firmware 1.6.5.25 Interesting. I checked ours. Our last 80xxxx and our current 81xxxx transmitters both have firmware 1.6.5.25. But based on the post from @Toni there can obviously be different firmware within what would otherwise seem to be the same version of the transmitter if only looking at serial number prefix. ---
**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 19, 2019, 1:30am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/18 "2019-11-19T01:30:04Z")
> [@Thomas](#): > > Interesting. I checked ours. Our last 80xxxx and our current 81xxxx transmitters both have firmware 1.6.5.25. But based on the post from @Toni there can obviously be different firmware within what would otherwise seem to be the same version of the transmitter if only looking at serial number prefix. This was noticed in TuD post earlier. Maybe 1.6.5.26 never made it out the door ! The person with 1.6.5.27 had to physically remove transmitter for 30 minutes to do sensor restart, which I didn’t have to do. ---
**Author:** ![Toni](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/toni/32/7583_2.png) [@Toni](https://forum.fudiabetes.org/u/Toni)\ **Post date:** [November 19, 2019, 12:25pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/19 "2019-11-19T12:25:43Z")
OK. Most of the comments here are off topic as others have noted. I am the original poster. I am not talking about sensors. I am talking about resetting a specific TRANSMITTER with a specific firmware. ---
**Author:** ![Toni](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/toni/32/7583_2.png) [@Toni](https://forum.fudiabetes.org/u/Toni)\ **Post date:** [November 19, 2019, 12:35pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/20 "2019-11-19T12:35:30Z")
My thinking is that it might be helpful if we report what transmitter and firmware we use and whether the reset works or doesn’t work. We can talk about sensors on a different thread. ---
**Author:** ![Chris](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/chris/32/382_2.png) [@Chris](https://forum.fudiabetes.org/u/Chris)\ **Post date:** [November 20, 2019, 12:12am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/21 "2019-11-20T00:12:30Z")
@Toni, I cleaned up your topic which as you rightly note had been hijacked, including by me. So here you go, clean thread to finish your interesting discussion. Sorry about the noise. ---
**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 20, 2019, 12:28am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/22 "2019-11-20T00:28:09Z")
> [@Toni](#): > > My thinking is that it might be helpful if we report what transmitter and firmware we use and whether the reset works or doesn’t work. When time for me to reset, I will update. ---
**Author:** ![Toni](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/toni/32/7583_2.png) [@Toni](https://forum.fudiabetes.org/u/Toni)\ **Post date:** [November 22, 2019, 9:27am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/23 "2019-11-22T09:27:22Z")
Thank you @Chris. ---
**Author:** ![static1333](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@static1333](https://forum.fudiabetes.org/u/static1333)\ **Post date:** [December 27, 2019, 5:43pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/24 "2019-12-27T17:43:00Z")
I have a .27 firmware 81xxxx transmitter and have been unsuccessful in resetting the transmitter. ---
**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:** [December 28, 2019, 4:31am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/25 "2019-12-28T04:31:07Z")
> [@MM2](#): > > I have 81xx with firmware 1.6.5.25, and will attempt reset in about 60 days. I was able to do reset on 81xx transmitter, using xDrip. But the transmitter only lasted about 2 more weeks, and the battery level was too low. Now using a 8G transmitter with 2.18.2.88 firmware. ---
**Author:** ![RCA221](https://avatars.discourse-cdn.com/v4/letter/r/7ab992/32.png) [@RCA221](https://forum.fudiabetes.org/u/RCA221)\ **Post date:** [July 29, 2020, 11:58pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/26 "2020-07-29T23:58:08Z")
I also reset my 81XX transmitter with Xdrip. Reset to zero on day 87. Now on day 46. ---
**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:** [July 30, 2020, 4:48am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/27 "2020-07-30T04:48:58Z")
In xDrip system status, can you check firmware version? Most likely it will be earlier version, since some people could reset 81xx transmitters while others could not, and we think it is related to firmware. ---
**Author:** ![RCA221](https://avatars.discourse-cdn.com/v4/letter/r/7ab992/32.png) [@RCA221](https://forum.fudiabetes.org/u/RCA221)\ **Post date:** [July 30, 2020, 10:41am UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/28 "2020-07-30T10:41:46Z")
firmware version 1.6.5.25 2nd firmware version 1.6.13.139 ---
**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:** [July 30, 2020, 5:24pm UTC](https://forum.fudiabetes.org/t/can-an-81xxxx-dexcom-transmitter-with-1-6-5-27-firmware-be-reset/8704/29 "2020-07-30T17:24:23Z")
Thats consistent with others. The .25 version works, .27 doesn’t. Thanks.