# Firmware upgrade for UBLOX SARA-R410M-02B on the MKR NB 1500 #2

**URL:** <https://forum.arduino.cc/t/firmware-upgrade-for-ublox-sara-r410m-02b-on-the-mkr-nb-1500-2/699292>\
**Category:** MKR NB 1500\
**Created:** [March 8, 2021, 1:17pm UTC](https://forum.arduino.cc/t/firmware-upgrade-for-ublox-sara-r410m-02b-on-the-mkr-nb-1500-2/699292 "2021-03-08T13:17:33Z")\
**Posts on this page:** 1\
**Showing post:** 33

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**Author:** ![rhttu](https://avatars.discourse-cdn.com/v4/letter/r/6de8d8/32.png) [@rhttu](https://forum.arduino.cc/u/rhttu)\
**Post date:** [September 29, 2021, 4:53am UTC](https://forum.arduino.cc/t/firmware-upgrade-for-ublox-sara-r410m-02b-on-the-mkr-nb-1500-2/699292/33 "2021-09-29T04:53:34Z")

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In [this](https://forum.arduino.cc/t/mkr-nb-1500-power-saving-mode/685250/5) thread, it is mentioned that there may be issues in the R410M's firmware that cause it to hang up after a while. I upgraded the firmware according to the above and while I haven't figured out the exact time threshold, it seems to go into a sleep state of some kind after roughly 1.5 to 2 hours. I then sent it a text message and it replied about 45 minutes later, at which point all text message attempts following that moment were responded to pretty instantly. The above thread also mentions AT&T being the possible culprit.

Should executing

```cpp
AT+CPSMS=0
AT+CFUN=15

```

resolve this issue? Think maybe what they're considering unresponsive is just an AT&T PSM network assignment?

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