The buttons on the touchpad and mouse do not work

Fkph Said:

"The buttons on the touchpad and mouse do not work: [...]I erased the mac via my iPhone, but now I can't restore anything, because mouse clicking also doesn't work on the touchpad and on the external mouse.[...]"

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Troubleshooting the Trackpad and Keyboard:

Perform the Following with the External Keyboard:

• Reset the SMC and your NVRAM:

(Applies to Intel-based Macs Only) Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for keyboard) become manipulated, technically. So, reset the SMC and NVRAM.

• Boot into Safe Mode:

When you boot into Safe Mode, items load by default, with certain settings and caches set aside. Go Here: Start Up your Mac in Safe Mode - Apple Support

Fkph Said:

"There is no reaction too"

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Troubleshooting the Trackpad and Keyboard After macOS Update:

Learn from This:

First off, learn from this, knowing to always backup your Mac every so often, so that you a have something to restore your Mac from, for instances such as this. So, restore from one, if you have ever made one.

Reinstall the macOS Anew:

See if this Site Helps: How to Reinstall the macOS Anew - No TMB Prior to Upgrade - User Tip. Format the hard drive with the applicable macOS, on Step D.

In Depth:

Pretty much, it is a matter of:

1. Erasing: and formatting your hard drive to APFS
2. Installing: [the applicable macOS] via a USB Bootable Installer
3. Restoring: info from a Time Machine Backup, using Migration Assistant

Fkph Said:

"The buttons on the touchpad and mouse do not work: [...]I erased the mac via my iPhone, but now I can't restore anything, because mouse clicking also doesn't work on the touchpad and on the external mouse.[...]"

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Use the Tab Key:

What happens when you use the tab key to go textbox to textbox? Does that let you proceed?