How To Unlock Bootloader Without Sim Card [hot] [2026]

OpenTimestamps aims to be a standard format for blockchain timestamping.

Stamp & Verify

Use the in-browser stamper and verifier

How it works

Details on OpenTimestamps

Members

Companies using OpenTimestamps

Code repositories

OpenTimestamps repositories

Mailing lists

OpenTimestamps announcements

Stamp & Verify

Drop here a file to stamp
OR
an .ots proof file to verify


The hash is calculated on your browser preserving your privacy. More...
Timestamping proof download will start automatically after uploading document.


Go to Settings > Additional Settings > Developer Options and enable OEM Unlocking and USB Debugging .

: The user enters this token directly into the Fastboot interface on their PC. The device verifies the token against its own internal hardware signatures, bypassing the need for a SIM card or manufacturer account login on the device itself. 2. Current "SIM-Free" Methods by Device

Xiaomi is the most restrictive brand regarding SIM cards. Their official Mi Unlock tool mandates that you "bind" your Mi Account to the device using only; Wi-Fi is not permitted for this step. how to unlock bootloader without sim card

On Android:

Report generated for technical assistance. Always follow your device’s official guidelines where possible. Go to Settings > Additional Settings > Developer

Notes: Some OEM portals require an account and device identifiers only — no SIM needed.

Fortunately, there are several methods to unlock the bootloader without a SIM card. These methods may vary depending on the device manufacturer and model, but we'll cover some of the most common techniques. On Android: Report generated for technical assistance

: Use the volume buttons on the phone to select "Unlock" and press power . Bypassing SIM Requirements (Xiaomi/Poco/Redmi)

Python

Javascript

Java


$ pip3 install opentimestamps-client
$ ots stamp my-file
More 

$ npm install -g javascript-opentimestamps
$ ots-cli.js stamp my-file
More 

$ git clone https://github.com/opentimestamps/java-opentimestamps
$ cd java-opentimestamps
$ mvn install
$ java -jar target/OtsCli.jar stamp my-file
More

Calendars

The following are the, free to use, default calendars used by OpenTimestamps. They rely on donations to reduce maintainers efforts, they accept bitcoin and some accept lightning network payments. Check the calendars uptime.
 

Alice

Bob

Finney

Catallaxy

How To Unlock Bootloader Without Sim Card [hot] [2026]

Go to Settings > Additional Settings > Developer Options and enable OEM Unlocking and USB Debugging .

: The user enters this token directly into the Fastboot interface on their PC. The device verifies the token against its own internal hardware signatures, bypassing the need for a SIM card or manufacturer account login on the device itself. 2. Current "SIM-Free" Methods by Device

Xiaomi is the most restrictive brand regarding SIM cards. Their official Mi Unlock tool mandates that you "bind" your Mi Account to the device using only; Wi-Fi is not permitted for this step.

On Android:

Report generated for technical assistance. Always follow your device’s official guidelines where possible.

Notes: Some OEM portals require an account and device identifiers only — no SIM needed.

Fortunately, there are several methods to unlock the bootloader without a SIM card. These methods may vary depending on the device manufacturer and model, but we'll cover some of the most common techniques.

: Use the volume buttons on the phone to select "Unlock" and press power . Bypassing SIM Requirements (Xiaomi/Poco/Redmi)

Repositories

Client

Client tool to perform stamping of files through a calendar server and to verify OpenTimestamps proof

opentimestamps-client

Server

Calendar Server receiving timestamp request from clients

opentimestamps-server

Python

Common library

python-opentimestamps

Javascript

Common library & Client tool

javascript-opentimestamps

Java

Common library & Client tool

java-opentimestamps

Rust

Rust library

rust-opentimestamps