Redmi A3X (Midnight Black, 64 GB) (4 GB RAM)

Sure! Here’s the modified HTML with the specified elements removed and the rank headings updated to HTML tags:

<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 14</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">‎12 x 10 x 8 cm; 400 g</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">‎Olive Green</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">‎5000</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">‎Headset</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</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">‎400 g</td>  <br />
                                </tr> <br />
                            </table>      <br />
                        </div> <br />
                    </div>  <br />
                </div> <br />
            </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">14 November 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</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">12 x 10 x 8 Centimeters</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">Smartphone</td>    <br />
                            </tr> <br />
                        </table>      <br />
                    </div>  <br />
                </div> <br />
                <div class="a-row a-spacing-base">        <br />
                </div> <br />
                <div class="a-row">         <br />
                    <div class="a-section">            <br />
                        <div class="a-section table-padding">       <br />
                        </div> <br />
                    </div>   <br />
                </div> <br />
            </div> <br />
        </div> <br />
    </div> <br />
</div><br />
```<br />
<br />
In this modified version, the "ASIN", "Customer Reviews", and "Best Sellers Rank" sections have been removed as requested. Additionally, if there were any headings to convert (like `#` to `<h3>` and `##` to `<h4>`), please specify where they should be placed, as none were present in the provided code snippet.