is a legitimate file manager and APK editor tool for Android. However, the phrase "key recharge" typically refers to purchasing or renewing a license key for the premium version of the app. That's a normal commercial transaction, not a hack or exploit.
Instead of recharging, you can use an external, free tool. Mt Manager Key Recharge
: Managing system directories and file permissions (requires Root access MT Manager for Android Important Security Warnings Avoid "Cracked" Versions MT Manager is a legitimate file manager and