Dell Wyse T00X 1GR DVI ES US: how to upgrade ThinOS to full version?

Hi

We need to uprdade our "Citrix only" T00X  thin client to full version of ThinOS

Recommended driver page https://www.dell.com/support/home/en-us/product-support/product/wyse-3010tc-series/drivers

We can download "ThinOS 8.6_206 English Raw Image file for Dell Wyse 3010 thin clients" and "ThinOS 8.5_024 English Raw Image file for Dell Wyse 3010 thin clients"

At first we tryed v.8.5_024

According to instructions we copyed files to ftp folders - wyse/wnos/pkg , created file wnos.ini with text "Autoload=1 loadpkg=1 Addpkg=TCX,FR,horizon"

Configured thin client wrote down to log file on usb-flash:

"
17:52:39 Accessing system profile ...
17:52:39 Checking Software ftp:/wnos/T00_xen.bin ...
17:52:39 Contacting SNTP [pool.ntp.org] ...
"

It looking for T00_xen.bin? OK, we renamed DOVE_boot to T00_xen.bin

Next log was

"
17:55:32 Contacting File Server ...
17:55:33 Accessing system profile ...
17:55:34 Checking Software ftp:/wnos/T00_xen.bin ...
17:55:34 Invalid Firmware( 2.5_024): OEM ID 0x0
17:55:35 Contacting SNTP [pool.ntp.org] ...
"

and no any ThinOS update

Whats wrong? How to update it properly? FTP server works good, thin client is reading files from it.