New 14.1.67.2046 version here: Intel (Converged Security) Management Engine: Drivers, Firmware and Tools (2-15) - Special Topics / Intel Management Engine - Win-Raid Forum (level1techs.com)
or here on ROG forum: [FIRMWARE] Intel ME (H470/Z490) (asus.com)
EDIT: Easy there… the linked files/tools are not my work and the 1rst link is to read and learn, anything else related to the 2nd link is outside this forum but the archives have their own instructions…but that you didnt know rigth. RUSH is the mother of all mistakes…Over_n_OUT.
EDIT: No, sorry but i have no guide for “regular users” to downgrade the ME, too risky on modern bios/motherboards. I doubt that your performance issues is all due to the ME firmware…