Bosch Kiox display frozen/blocked — how do I reset it?

My Kiox is blocked how to reset it.

@Greg Watts

A "blocked" Kiox almost always means one of two things — a Bosch lock/theft-protection state, or a jammed communication error where the display won't talk to the motor. They fix differently, so let's cover both.

1. If it's the Bosch Lock / Kiox lock ("blocked" screen):
This is the security feature — the bike stays locked until it recognises the paired phone/display. To clear it:
• Open the Bosch Flow app (or eBike Connect on older Smart System), go into your bike's settings and toggle the Lock function off. That releases the block.
• If the display was paired to a phone that's no longer nearby or that account, you'll need that original account/app to unlock it — Bosch ties the lock to the registered user.
• No app access at all? A Bosch dealer can unblock it through their diagnostic tool, but they'll want proof of ownership first (fair enough).

2. If it's a comms/error "blocked" (display frozen, won't wake, or throws an error code):
• Hard reset: power the bike fully off, then hold the display power button for 10+ seconds until it cycles. On battery-integrated systems, pull the battery for a minute if you can, then reseat it.
• Reseat the display: the Kiox is held magnetically and pops off — lift it, check the contacts are clean and dry, click it back on. @Stihldog → view post flagged that these do pop off easily, which is worth checking if it's intermittent.
• Check the cable: a loose display connector is a classic cause of a dead/blocked screen — @Rod B. → view post traced a bike-shutoff fault to exactly that kind of loose display connection on a Shimano system, and the principle carries: a flaky plug behaves like a fault.

One thing worth knowing — if you want to reset ride-mode/screen data, that's done on the Kiox menu itself under the reset options, not the app.

A couple of details would let me narrow this right down:
• What exactly does the screen show — the word "Blocked", an error code, or is it just dead?
• Which bike is it on, and are you on the older Kiox or the newer Kiox 300/400C with Flow app?

Tell me what it's displaying and I'll get you straight to the fix.