POCO F4 5G, Night Black (6GB, 128GB)

Here is the modified HTML snippet with the requested changes:

<div class="a-row a-spacing-top-base"><br />
    <div class="a-column a-span6"><br />
        <div class="a-row a-spacing-base"><br />
            <div class="a-row a-expander-container a-expander-extend-container"><br />
                <div class="a-row"><br />
                    <div class="a-column a-span6"><br />
                        <h1 class="a-size-medium a-spacing-small">Technical Details</h1><br />
                    </div><br />
                </div><br />
                <div data-expanded="true" class="a-expander-content a-expander-extend-content"><br />
                    <div class="a-row a-expander-container a-expander-inline-container"><br />
                        <div data-expanded="true" class="a-expander-content a-expander-section-content a-section-expander-inner"><br />
                            <table id="productDetails_techSpec_section_1" class="a-keyvalue prodDetTable" role="presentation"><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">OS</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Android 12.0</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Product Dimensions</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎18 x 8 x 3 cm; 250 g</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Batteries</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎1 Lithium Ion batteries required. (included)</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Other display features</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Wireless</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Form factor</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Bar</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Colour</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Night Black</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Battery Power Rating</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎4500 Milliamp Hours</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Whats in the box</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Handset, Power Adapter (67W), USB Type A-C Cable, USB Type C- 3.5 mm Converter, Sim Ejector Tool, Transparent Case, Pre-Applied Screen Protector, User Guide, Warranty Card</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Manufacturer</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎Xiaomi Technology India Pvt. Ltd.</td><br />
                                </tr><br />
                                <tr><br />
                                    <th class="a-color-secondary a-size-base prodDetSectionEntry">Item Weight</th><br />
                                    <td class="a-size-base prodDetAttrValue">‎250 g</td><br />
                                </tr><br />
                            </table><br />
                        </div><br />
                    </div><br />
                </div><br />
            </div><br />
            <div class="a-row a-spacing-base"></div><br />
        </div><br />
        <div class="a-column a-span6 a-span-last"><br />
            <div class="a-row a-spacing-base"><br />
                <div id="productDetails_db_sections" class="a-section"><br />
                    <h1 class="a-size-medium a-spacing-small secHeader">Additional Information</h1><br />
                    <div class="a-section table-padding"><br />
                        <table id="productDetails_detailBullets_sections1" class="a-keyvalue prodDetTable" role="presentation"><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Date First Available</th><br />
                                <td class="a-size-base prodDetAttrValue">11 October 2024</td><br />
                            </tr><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Manufacturer</th><br />
                                <td class="a-size-base prodDetAttrValue">Xiaomi Technology India Pvt. Ltd.</td><br />
                            </tr><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Packer</th><br />
                                <td class="a-size-base prodDetAttrValue">Xiaomi Technology India Pvt. Ltd., Orchid Blck, EmbassyTech Village, Devarabeesanahalli,Bangalore - 560103, Karnataka</td><br />
                            </tr><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Item Dimensions LxWxH</th><br />
                                <td class="a-size-base prodDetAttrValue">18 x 8 x 3 Centimeters</td><br />
                            </tr><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Net Quantity</th><br />
                                <td class="a-size-base prodDetAttrValue">1 Count</td><br />
                            </tr><br />
                            <tr><br />
                                <th class="a-color-secondary a-size-base prodDetSectionEntry">Generic Name</th><br />
                                <td class="a-size-base prodDetAttrValue">Smart Phone</td><br />
                            </tr><br />
                        </table><br />
                    </div><br />
                </div><br />
                <div class="a-row a-spacing-base"></div><br />
                <div class="a-row"><br />
                    <div class="a-section"><br />
                        <div class="a-section table-padding"></div><br />
                    </div><br />
                </div><br />
            </div><br />
        </div><br />
    </div><br />
</div><br />
```<br />
<br />
### Changes Made:<br />
- Removed the rows for "ASIN", "Customer Reviews", and "Best Sellers Rank" from the table.<br />
- Converted `#` into an `<h3>` tag and `##` into an `<h4>` tag as per your instructions (though no such headers were present in the provided HTML). If there are specific locations you would like those applied, please indicate, and I can make adjustments accordingly.