At last I had time to spend testing the new FW.

No result.

These are the steps I followed:

sudo i2cset -y 1 0x6b 0x02 0x10
sudo i2cset -y 1 0x6b 0x02 0x01
sudo python  pico_v0.3a.py -l -f  ups_pico4_main_Firmware_0133_12062022.hex

result:
2022-08-24 21:52:08,223 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 21:52:08,224 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 21:52:08,225 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 21:52:08,350 [WARNING] Firmware file verification OK
2022-08-24 21:52:08,352 [WARNING] Current firmware release: 0x11d
2022-08-24 21:52:41,600 [ERROR] Failed to establish serial communication with PICO UPS

 sudo i2cset -y 1 0x6b 0x02 0x02
 sudo i2cset -y 1 0x6b 0x02 0x20
sudo python  pico_v0.3a.py -l -f  ups_....hex

result:
2022-08-24 21:54:19,730 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 21:54:19,731 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 21:54:19,733 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 21:54:19,858 [WARNING] Firmware file verification OK
2022-08-24 21:54:19,861 [WARNING] Current firmware release: 0x11d
2022-08-24 21:54:21,302 [WARNING] Serial link with PICO UPS verified
Uploading firmware |2022-08-24 21:54:22,212 [ERROR] Failed to recieve data ACK from UPIS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 586, in wait_ack
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 21:54:22,214 [ERROR] Failed to ack the line 16
|

sudo i2cset -y 1 0x6b 0x02 0x03
sudo i2cset -y 1 0x6b 0x02 0x30
sudo python  pico_v0.3a.py -l -f  ups_....hex

result:
2022-08-24 22:02:40,803 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 22:02:40,803 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 22:02:40,805 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 22:02:40,927 [WARNING] Firmware file verification OK
2022-08-24 22:02:40,929 [WARNING] Current firmware release: 0x11d
2022-08-24 22:02:41,602 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 572, in send_line
    self.pico_serial.write(line.encode())
AttributeError: 'bytes' object has no attribute 'encode'
2022-08-24 22:03:13,533 [ERROR] Failed to establish serial communication with PICO UPS

... 0x04 + 0x40 :

2022-08-24 22:04:08,667 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 22:04:08,668 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 22:04:08,669 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 22:04:08,796 [WARNING] Firmware file verification OK
2022-08-24 22:04:08,798 [WARNING] Current firmware release: 0x11d
2022-08-24 22:04:26,903 [ERROR] Failed to recieve data ACK from UPIS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 586, in wait_ack
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,008 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,109 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,211 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,312 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,413 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,515 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,616 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,717 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,818 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:27,920 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:28,021 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:28,122 [ERROR] Failed to send data to PICO UPS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 570, in send_line
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:04:29,236 [ERROR] Failed to establish serial communication with PICO UPS

... 0x05 + 0x50 :

2022-08-24 22:07:43,147 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 22:07:43,148 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 22:07:43,149 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 22:07:43,275 [WARNING] Firmware file verification OK
2022-08-24 22:07:43,278 [WARNING] Current firmware release: 0x11d
2022-08-24 22:07:44,020 [ERROR] Failed to recieve data ACK from UPIS
Traceback (most recent call last):
  File "/home/pi/UPS-PIco4-files_0133_12062022/pico_v0.3a.py", line 586, in wait_ack
    for line in self.pico_serial:
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 577, in read
    raise SerialException(
serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2022-08-24 22:08:15,946 [ERROR] Failed to establish serial communication with PICO UPS

... 0x06 + 0x60 :

2022-08-24 22:09:01,223 [WARNING] PICO PCB version: 0x41 PICO model: B Stack
2022-08-24 22:09:01,224 [WARNING] RPi model: Raspberry Pi 4 Model B Rev 1.1
2022-08-24 22:09:01,226 [WARNING] MD5 of the firmware file: 74ffe9faeb89ccecd375ff1eaec63a96
2022-08-24 22:09:01,352 [WARNING] Firmware file verification OK
2022-08-24 22:09:01,355 [WARNING] Current firmware release: 0x11d
2022-08-24 22:09:34,596 [ERROR] Failed to establish serial communication with PICO UPS

and what?

@piadmin 

I left a post some time ago yet waiting for moderation...

It seems there is something wrong in serial communication between pi and pico; please, look at my post where I reported the trace of actions.

@andycianci 

Sorry receiving so many porn email, so missed you. Check it and answer today later on

br PiM