Hi,
Q1.can you share me any utility to browse and send the file.?
You may refer to https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/board-update-portal-based-on-nios-ii-processor-with-epcq.html for the reference design based on Cyclone V E with EPCQ and modify the design from AN741 (https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an741.pdf) which provided you the guideline on the Max 10 remote update through UART. You can modify it so that you are using the Ethernet port to received the new image.
Q2.from google i have got an 429 application software shall i use it for my update? (but it is not opening properly)
You may use it as reference or use the reference above.