V2.3DC- with App version 2.4.99 and FW 2.1.6(1) – Please help for Upgrade

Hi OS Team and community, as my V2.3 DC works for more than 8 years with 18 Sonaloids stations and 40 Lights I have to admit that the creators did a tremendous job.

As you shall never touch running system i want to do so to put it behind a v-Lan. However.
Furthermore i like to make use of the MQTT capability in newer SW versions (as per my understanding).

I did follow your instructions on : https://openthings.freshdesk.com/support/solutions/articles/5000832311-opensprinkler-2-x-firmware-update-guide
download even 3 different firmware os210, OS 212 and the latest os_221_rev4_avr1.hex.

With 4 different USB cables, 1 Windows machine AVRDUDE 8.1, another Linux (Mint)Machine AVRDUDE 7.1 + AVR DUDE 4.1….. i did an make it.

Thats at best case my output… i did try with 115000, lower, indeed change the usb ports… Play Lottery games on the B1 b2 b3 Button or in combination (even as documentet for lower than 2.3. I wont give up. I like that guy. Do some of zou have any idea that may help me ? :

— QUOTE LINUX OUTPUT —-
root@user-GT70:/usr/bin# sudo avrdude -c arduino -p m1284p -P /dev/ttyUSB0 -U flash:w:os_221_rev1.hex

avrdude: AVR device initialized and ready to accept instructions
avrdude: device signature = 0x1e9705 (probably m1284p)
avrdude: Note: flash memory has been specified, an erase cycle will be performed.
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude error: programmer is not responding
avrdude error: programmer is not responding
avrdude error: programmer is not responding
avrdude: reading input file os_221_rev1.hex for flash
with 108384 bytes in 1 section within [0, 0x1a75f]
using 424 pages and 160 pad bytes
avrdude: writing 108384 bytes flash …

Writing | ————————————————– | 0% 5.01 s

avrdude error: programmer is not responding
^C
root@user-GT70:/usr/bin# sudo avrdude -c arduino -p m1284p -P /dev/ttyUSB1 -U flash:w:os_221_rev1.hex
avrdude OS error: cannot open port /dev/ttyUSB1: No such file or directory
avrdude error: unable to open programmer arduino on port /dev/ttyUSB1

avrdude done. Thank you.
—-QUODTE LINUX END —–

root@user-GT70:/usr/bin#

In the worst case i have some programmer, arduous etc laying around but if it works via USB or may put a gipo to 0 will be great. Any idea. ? 1000 times Thanks
one of my ide i had in mind if a external usb hub will help for power supply or power the device directly via the 12 volt.any idea will be appreciated .