It looks like it is new as of v4.15, see release notes: https://www.septentrio.com/resources/mosaic-X5/mosaic-X5+Firmware+v4.15.1+Release+Notes.pdf Does this need to set a default password have any implication for how the ESP-32 (on the mosaic and facet mosaic) interacts with the Septentrio module?…

Hi Alexander ( @Alexander-Puckhaber ), Thank you for the suggestions / contributions. To hopefully close the loop on this, we have updated the RTK Everywhere Firmware docs in several places, but the biggest changes are here: Updating mosaic-X5 Firmware - SparkFun RTK Everywhere Product M…

Found this post from December, maybe it will help? [image] Help: Mosaic-X5 HAT unresponsive after failed firmware upgrade GPS/GNSS Septentrio has made it more difficult to use the receiver for “security” reasons. The factory username and password you need migh…

I’ve also asked someone from the engineering team to lend some clarity but they’re out today; I’ll give an update as soon as I get one (should be by tomorrow)!

Hi Alexander ( @Alexander-Puckhaber ), To be completely honest, this is a can of worms that we have been reluctant to open… But we will open it soon and come up with a solution. If you upgrade your mosaic-X5 to 4.15.1, the username and password are mandatory. This will almost certainly stop the RTK…

PS. if you were talking about the RTK mosaic-X5 , the situation there is the same. The IDF firmware running on the ESP32 is also unaware of the X5 username and password. If you upgrade that product to 4.15.1, it will almost certainly stop the ESP32 from communicating with the X5. That may not break e…

Thank you for the explanation. I have already upgraded to 4.15.1 so I was seeing issues. When I reset from firmware default, things like the LCD screen on the Mosaic Facet seemed to work and Bluetooth serial sent valid data to my mapping app. But after I logged in to the Septentrio interface to make…

Hi Alexander ( @Alexander-Puckhaber ), Download links for earlier mosaic firmware: 4.14.10.1 4.14.4 More Septentrio docs that may help: Cybersecurity guidelines: How can I recover connection to my receiver if I’ve lost my credentials? Cybersecurity guidelines: Log-in procedure Don’t forget tha…

New Septentrio mosaic-x5 v4.15.1 firmware has password security added, any implications for the ESP-32?

GPS/GNSS

YellowDog April 15, 2026, 6:14pm 2

Found this post from December, maybe it will help?

Topic		Replies	Views
Help: Mosaic-X5 HAT unresponsive after failed firmware upgrade GPS/GNSS	6	176	December 6, 2025
Septentrio Mosaic X5 GNSS receiver module Projects	8	5802	March 25, 2024
Reflash ESP32 on Mosaic X5 GPS/GNSS	2	86	May 5, 2025
Mosaic x5 update not working over wifi GPS/GNSS	4	87	February 15, 2025
Mosaic X5 & ESP not able to get onto 2 different networks GPS/GNSS	4	105	February 6, 2026

New Septentrio mosaic-x5 v4.15.1 firmware has password security added, any implications for the ESP-32?

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