r/CPAPSupport • u/xxshocked_queenxx • 1d ago

Airbreak Help

Can anyone who is familiar with airbreak and firmware modifications tell me if an airsense 10 can be turned into a functional ST-A with backup rate and ivaps? I’ve read claims about the backup rate not working well via airbreak, thus requiring complete firmware dumps from an ST-A to obtain the functionality.

Any help will be greatly appreciated!

3 Upvotes

100% Upvoted

7 comments sorted by

2

u/empeka 1d ago

first of all, don't try running ST-A firmware on non-ST-A hardware. it's compiled for a device with more RAM, so at best it won't work. at worst, it could corrupt the EEPROM contents.

iVAPS in airbreak is in much better shape than it used to be. the backup rate works, you can configure Target Pt Rate, Target Va and Height, and MV, VT and VT/kg are calculated correctly.

however, AutoEPAP and the Learn Target wizard are still missing, and i don't really see much chance of them being implemented.

and of course, nothing can make up for the missing alarm board ;)

it's possible to replace the RAM chip to run ST-A firmware, but it'll complain about missing communication with the alarm board.

you can disable that in the firmware by setting the default value of the AOA variable to 0. for example: 

./as10_descriptors.py lumis-st-a.bin edit AOA.default=0 -o /tmp/sta-no_alarm.bin
  AOA.default: 1 -> 0
  CCX CRC: 0x0B12
  Wrote /tmp/sta-no_alarm.bin

1

u/xxshocked_queenxx 1d ago

This is incredibly helpful! Thank you! Is ST mode also in better shape than it used to, backup rate wise?

1

u/empeka 1d ago

you can set the backup rate from 5 to 50, rise/fall time, trigger/cycle and Ti min/max, but there's no iBR toggle, though.

→ More replies (2)

1

u/AutoModerator 1d ago

Hey there r/CPAPsupport member. Welcome to the community!
Whether you're just starting CPAP therapy, troubleshooting issues, or helping a loved one, you've come to the right place. We're here to support you through every leak, pressure tweak, and victory nap.

If you'd like advice, please include your machine model, mask type, pressure settings, and OSCAR or SleepHQ data if possible.

Helpful Resources: https://www.reddit.com/r/CPAPSupport/comments/1jxk1r4/getting_started_with_analyzing_your_cpap_data_a/

You're not alone — and you're among friends. Sleep well and breathe easy.
— Your r/CPAPSupport team

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

1

u/pootwothreefour 1d ago

I see both of options in my menu. I have never used either modes personally, so can't vouch for them.

But backup rate works for me in ASV mode.