MMR3 Powering through 5V connection ?
Please move this discussion if in the wrong section.
I was in discussion with one of your team members via email a few weeks ago about an issue not being able to use the new MMR3s on 5V alone. My understanding from these emails is that firmware 1.4.4 requires a Li-Po connected to the IMU, as compared to 1.3.8.
I have several MMR3s that have had their Li-Po's removed, and have been soldered onto PCBs. The IMU's only voltage in is a 5V supply into the 5V pin. The BATT input is disconnected.
These were running 1.3.6/8 firmware beforehand. The Diagnostic page of Metabase does not populate so I only have the raw values through the nRF Connect app:
Model String No.: 0x35
Hardware Rev String: 0x302E33
Firmware Rev String: 0x302E332E31
The operation fails when after pressing 'UPDATE FIRMWARE'. A loading circle briefly happens and the following message pops up
"Error Failed to connect to 'MetaBoot'. Would you like to try again? Operation Failed: Device disconnected unexpectedly"
I am using an iPhone 7 Plus with Metabase app 4.2.1, and have repeated this with a iPhone XS with the same results. I have also used a Google Pixel 3 and Samsung Galaxy S8, however these do not show up under the Metabase app.
As a result, two soldered IMU devices that I have attempted to update to 1.4.4 from 1.3.6/8 no longer work and are stuck in MetaBoot. These were working fine beforehand.
Does firmware 1.4.4 require the BATT connection to be utilized? If so, can the BATT and 5V input pins be bridged to fool the device into working?
What other solutions am I able to take?