D-Link Wireless Routers for Home and Small Business > DIR-859

D-LINK - DIR-859 (A3) - FW106b01beta02 to stable FW: 1.05

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I upgraded my D-link router to beta firmware (FW106b01beta02) and now I have problems with speed of my WI-FI.
Itīs lower than before the upgrade.
Please help me.

How can I downgrade my firmware? (Sorry for bad English.)


* What region are you located?
* Are you wired or wireless connected to the router?
* Has a Factory Reset been performed?
* Was a Factory Reset performed before and after any firmware updates then set up from scratch?  Link> >FW Update Process

* Which D-Link support site are you getting the FW from
Internet Service Provider and Modem Configurations

* What ISP Service do you have? Cable or DSL?
* What ISP Modem Mfr. and model # do you have?
How are you speedtesting? wired or wireless?


I am at Czech Republic.
I use this site to download the beta: https://support.dlink.com/ProductInfo.aspx?m=DIR-859
My problem is that after upgrade my 5 GHz WI-FI signal show me only max. speed = 4 MB/s
Before upgrade to beta It was be around at 20 MB/s with 5 GHz WI-FI signal.
On 2.4 GHz it work good = max 6 Mb/s
By Ethernet cable on my PC it work good to = around 30 MB/s
After upgrade i try - Restore To Factory Default Settings but it donīt help.
My ISP Service is Czech Republic = UPC and I think its connected by optic cable.
Speed-tested on iPhone by Ookla app form App Store.


I would see if your regional site has FW for your region:

It show me this:

Current Firmware Version:   1.06
Current Firmware Date:   2017-12-19 15:24:00

If I try to upgrade the firmware itīs show error.
On CZ site i found this: https://eu.dlink.com/cz/cs/products/dir-859-wireless-ac1750-dual-band-gigabit-router#support


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