Great works, thank a lot for your feedback info. best wishes for you.

SN1908400135_INS_forum_1.1.2_e2_LOCK2.bin
With the whole bin, it is working now.

my email address: ekchen@aceinna.com
I will prepare whole bin for you, and get back to you later, pls send your backup bin to me, thanks a lot for your info.

it is on the surface of 300zi module, pls check again.
backup current whole EEPROM of your OpenIMU300ZI/ZA with ST-LINK, and send out BIN file by email or upload to Aceinna in forum, pls follow topic_4

it should be 10 figures, such as: 1808400528, no dash inside it.

what is the SN number of your 300ZI? it is in side surface of module, include 10 figures, such as: 1808400528 in my side.
did you download the FW precompiled bin file in ANS and try to burn by ST-Link again?

based on your description, below actions are recommend to recover and supply more info to Aceinna:

• backup whole EEPROM of your OpenIMU300ZI/ZA with ST-LINK, and send out BIN file by email or upload to Aceinna in forum, pls follow topic_4
• pls download the FW precompiled bin file in ANS and upload to unit from start address 0x08010000, topic_8
• power off unit, then restart Webserver_Win32_2.2.3.exe and your browser(Chrome), refresh browser page and try again.
• at last, pls follow the procedure in your attached link if still invalid in all above actions

For pi can read incoming ascii data we have now, I think we have to refer to openimu.py how to decode serial data based on current status. pls refer the function read()/openimu_get_packet()/parse_buffer(), all codes may help.
For protocol, you can refer to below links corresponding 'e2', 'z1' packets.
https://openimu.readthedocs.io/en/latest/apps/ins.html#the-definition-of-the-deaulft-output-packet-of-the-ins-app
https://openimu.readthedocs.io/en/latest/software/UARTmessaging.html#openimu-uart-messaging-framework

For coolterm, it is one UART assist tool, which can receive serial data directly which like HTerm used in my side, directly used it is ok. we should better have to confirm below points are right selected in the tool:
port is right;
baud rate is right;
show in HEX format or not HEX format based on your request;
wait your feedback.

pls use 1st port which is used for result data output, also you mentioned binary data from it.
pls check topic_8, 8. how to check the serial data by serial tool? pls receive data in HEX format or ascii format of each bytes.
https://forum.aceinna.com/topic/93/top-topics-of-common-operations-with-openimu-products/2
if you want to make your own scripts to receive serial data, pls refer to our repo python-driver:
https://github.com/Aceinna/python-openimu/blob/bugfix/openimu.py

3-2003017004.zip