L86 Baloon mode

Hello!
We need to launch a balloon into the sky for a research project, and we chose the Quecel L86 GPS for this mission because the supplier we purchased it from stated that it has a balloon mode and that it works up to altitudes of 80 km+. However, in our experiment, it only worked up to 9999.7 meters, and then it stayed at that altitude. I guess we couldn’t activate the mode.

My question is, how can we activate balloon mode? Can it be turned on permanently, or do we have to re-enable it every time we use it?

I’m using a Teensy 4.1 microcontroller, and I connected the GPS to one of the UART ports.

All commercial gnss modules (not for military use) are restricted by international convention…
however, in par.2.4.24 talk about 80km but the receiver does not emit any data.
Quectel_LC26G&LC26G-T&LC76G&LC86G_Series_GNSS_Protocol_Specification_V1.4.pdf (956.4 KB)
$PAIR003*39 → power off GNSS system
$PAIR080,3*2D ballon mode
$PQTMSAVEPAR*5A save
$PAIR023*3B reboot

is this codes same the L86 series?

for LC86G , chip Airoha…

If Mediatek chip, L86 & LC86L

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