#Flashing FrSky MX OTA [FAILED] Unable to communicate with bootloader...

5 messages · Page 1 of 1 (latest)

strong cliff
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I downloaded MX bootloader from this page: https://www.expresslrs.org/2.0/quick-start/receivers/r9/
When I try to flash the reciever with ExpressLRS through passthrough I get this error:
======== PASSTHROUGH INIT ========
Trying to initialize COM9 @ 420000

Attempting to detect FC UART configuration...
** Serial RX config detected: 'serial 3 64 115200 57600 0 115200'
Enabling serial passthrough...
CMD: 'serialpassthrough 3 420000'
======== PASSTHROUGH DONE ========

Attempting to reboot into bootloader...

[1] retry...

Bootloader type found : 'R9MX'

Got into bootloader after: 1 attempts

Wait sync...
[FAILED] Unable to communicate with bootloader...

*** [upload] Error -1
========================= [FAILED] Took 26.00 seconds =========================

Environment Status Duration

Frsky_RX_R9MX_via_BetaflightPassthrough FAILED 00:00:25.1000
==================== 1 failed, 0 succeeded in 00:00:25.1000 ====================

Any idea?
Thanks.

Frsky R9 - ExpressLRS

ExpressLRS aims to provide the best completely open, high refresh radio control link while maintaining a maximum achievable range at that rate with low latency. Vast support of hardware in both 900 Mhz and 2.4 GHz frequencies.

#

Ok, instead of uart4, I tried uart2 and for some reason it worked out, I don't know why, I would like to hear the explanation

sly void
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Some uarts are inverted for sbus on frsky receivers. Inversion is not required for elrs.

sly void
#

Docs above give full explanation to your issues.