I hea if I update my iPhone14proMax,its display will get full green color

That is completely untrue.

While updating iOS is not mandatory, but updating your iOS software provides essential security patches, bug fixes, and enhancements that fortify your device's defenses against potential vulnerabilities. By staying up to date, you ensure that your device benefits from the latest security measures implemented by Apple, reducing the risk of unauthorized access, data breaches, and other malicious activities. Regularly updating your iOS not only enhances the overall security of your device but also helps maintain the privacy and integrity of your personal information. Therefore, while it may not be obligatory, updating iOS is strongly recommended to ensure optimal protection for your device and sensitive data.

Updating iOS on your iPhone should not change your personal details nor damge the harware. iOS updates primarily focus on improving system performance, introducing new features, fixing bugs, and enhancing security. They are designed to preserve your personal data, settings, and information intact.

During an iOS update, your device's operating system is upgraded, but your personal data, such as contacts, photos, messages, and other information, should remain unchanged. However, it's always a good practice to perform a backup of your device before any major update to ensure that your data is safely stored.

It's important to note that while an iOS update itself should not alter personal details, it's possible that certain features or settings may be adjusted or improved with the update. In such cases, you may need to review and adjust specific settings to match your preferences after the update.

Always make sure to read and understand the update details provided by Apple before proceeding with an iOS update, and follow best practices such as backing up your device to minimize any potential risks or complications.