# HH41V: reconstructing the GOTU/SUDH update process

> HH41V maps the TCL/Alcatel mobile hotspot's FOTA update process, including its AP and modem package structure and GOTU/SUDH requests. It provides Python tools to inspect archive entries, fetch packages and compare package identity with a device configuration dump, plus notes on the updater and package inventory.

- Type: Case study
- Targets: Firmware · Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-07
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/devopnem/hh41v-fota>
- Primary source: <https://github.com/devopnem/hh41v-fota/blob/39f949cfcd7925b7e1f7e3f9e8614f05ae6a8593/README.md>
- Catalog page: <https://awesomerea.org/resources/hh41v-fota-case/>
- Record JSON: <https://awesomerea.org/resources/hh41v-fota-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/hh41v-fota-case/index.md)

## Requirements & limits

- **Prerequisites:** Python 3 and the standard library for the inspection tools.
- **Prerequisites:** A device configuration dump is needed for package identity checks; the repository's guarded installer checks CURef before passing a package to the vendor updater.
- **Limits:** The modem delta format is not yet mapped precisely.
- **License:** Code: MIT; documentation and data: CC BY 4.0.

## Primary sources

1. <https://github.com/devopnem/hh41v-fota/blob/39f949cfcd7925b7e1f7e3f9e8614f05ae6a8593/README.md>
2. <https://github.com/devopnem/hh41v-fota/blob/39f949cfcd7925b7e1f7e3f9e8614f05ae6a8593/docs/fota-protocol.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.