I finnally get the download link from WD forum. https://fox-exe.ru/WDMyCloud/WDMyCloud-Mirror-Gen2/Dev/WD-Recovery/ @hmartin thank you very muchby kingyond - Debian
thank you, bodhi and hmartin. this forum is very usful for me. i will try to install kernel 5 fom my WDMCG2.by kingyond - Debian