This issue occurs because &nbsp;your TV does not support the higher resolution. 
&nbsp;

STEP 1

Switch off the power for your box and make sure that the adapter&#39;s power light is off. 
&nbsp;

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<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e5f07887b7185c9671e_6018f50a197503f7a1d970e6_5fc0b7633124031c2e4b0877_a.png" /></div>
</figure>

 
STEP 2

Switch on the power for your box and make sure that the adapter&#39;s power light is on. 
&nbsp;

<figure class="w-richtext-figure-type-image w-richtext-align-center" data-rt-align="center" data-rt-type="image" id="">
<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e5f07887be268c9671c_6018f50a697f7ee7a4a7b719_5fc0b76331240373674b0873_b.png" /></div>
</figure>

STEP 3

Press the standby button repeatedly after switch on the power.

The Startup Options screen will appear on your TV.

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<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e5f07887b7c05c9671d_6018f50a2e13f685509c2130_5fc0b763312403329e4b0892_c.png" /></div>
</figure>

STEP 4

Press &quot;987&quot;&nbsp;to access the Advanced Startup Options menu.

Then, press &quot;1&quot;&nbsp;to initiate a reset setting.

<figure class="w-richtext-figure-type-image w-richtext-align-center" data-rt-align="center" data-rt-type="image" id="">
<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e5f07887b523ac9671f_6018f50a31a68489802044fa_5fc0b763312403a01f4b0896_d.png" /></div>
</figure>

STEP 5

Press &quot;OK&quot; to confirm restore to factory setting.

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<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e5f07887b471ec96720_6018f50a5f7f2c00cb5c8a17_5fc0b7633124032c464b089a_e.png" /></div>
</figure>

STEP 6

After the factory setting is restored, TV will turn blank.

Please wait until the box completes initiate setup.

<figure class="w-richtext-figure-type-image w-richtext-align-center" data-rt-align="center" data-rt-type="image" id="">
<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e6007887b96dcc96721_6018f50a03ea2e595e5120df_5fc0b76331240355964b0897_f_1.png" /></div>
</figure>

STEP 7

Press &quot;1&quot; to initiate Linux download on the software.

<figure class="w-richtext-figure-type-image w-richtext-align-center" data-rt-align="center" data-rt-type="image" id="">
<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e6007887b47b9c96723_6018f50aa217266a2d1d2572_5fc0b76331240385d64b0898_g.png" /></div>
</figure>

STEP 8

Once completed, the following screen will appear on your TV.

Refer to Installation Setup guide <a href="https://support.astro.com.my/question/installation-setup-ultra-box" id="" style="color: #ec008c; text-decoration: underline;" target="_blank">here</a> to complete the setup.

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<div id=""><img alt="" src="https://dj7fdt04hl8tv.cloudfront.net/acm/media/acm-4k-vod/62f21e6007887bf754c96722_6018f50a0e113cc8de4bc65d_5fc0b763312403d9984b0899_h.png" /></div>
</figure>