Again, try manually reinstalling the firwmare to it. Make sure to do it with a hardwired connection and reset the router afterwards. Then follow the install guide.
","body@stripHtml({\"removeProcessingText\":true,\"removeSpoilerMarkup\":true,\"removeTocMarkup\":true,\"truncateLength\":200})@stringLength":"208","postTime":"2020-07-03T08:35:42.025-07:00","lastPublishTime":"2020-07-03T08:35:42.025-07:00","images":{"__typename":"AssociatedImageConnection","edges":[],"totalCount":0,"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}},"attachments":{"__typename":"AttachmentConnection","pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null},"edges":[]},"solution":true,"metrics":{"__typename":"MessageMetrics","views":8284},"placeholder":false,"showMoveIndicator":false,"originalMessageForPlaceholder":null,"videos":{"__typename":"VideoConnection","edges":[],"totalCount":0,"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}},"isEscalated":null,"customFields":[]},"Rank:rank:57":{"__typename":"Rank","id":"rank:57","position":8,"name":"Guru - Experienced User","color":"002FFF","icon":null,"rankStyle":"FILLED"},"ModerationData:moderation_data:1940101":{"__typename":"ModerationData","id":"moderation_data:1940101","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"ModerationData:moderation_data:1940096":{"__typename":"ModerationData","id":"moderation_data:1940096","status":"APPROVED","rejectReason":null},"ForumReplyMessage:message:1940096":{"__typename":"ForumReplyMessage","id":"message:1940096","entityType":"FORUM_REPLY","eventPath":"category:home-wifi-routers/category:home-networking/category:English/community:ejquo23388board:en-home-routers-nighthawk-wifi-ax6/message:1940042/message:1940096","revisionNum":1,"uid":1940096,"depth":1,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Forum:board:en-home-routers-nighthawk-wifi-ax6"},"conversation":{"__ref":"Conversation:conversation:1940042"},"subject":"Re: Nighthawk AX4 not connecting to internet","readOnly":false,"editFrozen":false,"showMoveIndicator":false,"moderationData":{"__ref":"ModerationData:moderation_data:1940096"},"body":"Thanks for your help. Still won’t work on 5g, but we have internet.","body@stringLength":"67","rawBody":"Thanks for your help. Still won’t work on 5g, but we have internet.","author":{"__ref":"User:user:775710"},"isEscalated":null,"postTime":"2020-07-03T08:46:25.738-07:00","solution":false,"customFields":[],"attachments":{"__typename":"AttachmentConnection","edges":[],"pageInfo":{"__typename":"PageInfo","hasNextPage":false,"endCursor":null,"hasPreviousPage":false,"startCursor":null}},"repliesCount":2},"Revision:revision:1940101_1":{"__typename":"Revision","id":"revision:1940101_1","lastEditTime":"2020-07-03T09:04:43.200-07:00"},"QueryVariables:ReplyList:message:1940101:1":{"__typename":"QueryVariables","id":"ReplyList:message:1940101:1","value":{"id":"message:1940101","first":10,"sorts":{"postTime":{"direction":"ASC"}},"repliesFirst":3,"repliesFirstDepthThree":1,"repliesSorts":{"postTime":{"direction":"ASC"}},"useAvatar":true,"useAuthorLogin":true,"useAuthorRank":true,"useBody":true,"useKudosCount":true,"useTimeToRead":false,"useMedia":false,"useReadOnlyIcon":false,"useRepliesCount":true,"useSearchSnippet":false,"useAcceptedSolutionButton":true,"useSolvedBadge":false,"useAttachments":false,"attachmentsFirst":5,"useTags":false,"useNodeAncestors":false,"useUserHoverCard":false,"useNodeHoverCard":false,"useModerationStatus":true,"usePreviewSubjectModal":false,"useMessageStatus":true}},"CachedAsset:text:en_US-components/customComponent/CustomComponent-1755165470600":{"__typename":"CachedAsset","id":"text:en_US-components/customComponent/CustomComponent-1755165470600","value":{"errorMessage":"Error rendering component id: {customComponentId}","bannerTitle":"Video provider requires cookies to play the video. 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Are you sure you want to continue?","action.submit":"Continue","action.cancel":"Go Back"},"localOverride":false},"CachedAsset:text:en_US-components/messages/AcceptedSolutionButton-1755165470600":{"__typename":"CachedAsset","id":"text:en_US-components/messages/AcceptedSolutionButton-1755165470600","value":{"accept":"Mark as Solution","accepted":"Marked as Solution","errorHeader":"Error!","errorAdd":"There was an error marking as solution.","errorRemove":"There was an error unmarking as solution.","solved":"Solved","topicAlreadySolvedErrorTitle":"Solution Already Exists","topicAlreadySolvedErrorDesc":"Refresh the browser to view the existing solution"},"localOverride":false},"CachedAsset:text:en_US-components/messages/ThreadedReplyList-1755165470600":{"__typename":"CachedAsset","id":"text:en_US-components/messages/ThreadedReplyList-1755165470600","value":{"title":"{count, plural, one{# Reply} other{# Replies}}","title@board:BLOG":"{count, plural, one{# Comment} other{# Comments}}","title@board:TKB":"{count, plural, one{# Comment} other{# Comments}}","title@board:IDEA":"{count, plural, one{# Comment} other{# Comments}}","title@board:OCCASION":"{count, plural, one{# Comment} other{# Comments}}","noRepliesTitle":"No Replies","noRepliesTitle@board:BLOG":"No Comments","noRepliesTitle@board:TKB":"No Comments","noRepliesTitle@board:IDEA":"No Comments","noRepliesTitle@board:OCCASION":"No Comments","noRepliesDescription":"Be the first to reply","noRepliesDescription@board:BLOG":"Be the first to comment","noRepliesDescription@board:TKB":"Be the first to comment","noRepliesDescription@board:IDEA":"Be the first to comment","noRepliesDescription@board:OCCASION":"Be the first to comment","messageReadOnlyAlert:BLOG":"Comments have been turned off for this post","messageReadOnlyAlert:TKB":"Comments have been turned off for this article","messageReadOnlyAlert:IDEA":"Comments have been turned off for this idea","messageReadOnlyAlert:FORUM":"Replies have been turned off for this discussion","messageReadOnlyAlert:OCCASION":"Comments have been turned off for this event"},"localOverride":false},"ModerationData:moderation_data:1940106":{"__typename":"ModerationData","id":"moderation_data:1940106","status":"APPROVED","rejectReason":null,"isReportedAbuse":false,"rejectUser":null,"rejectTime":null,"rejectActorType":null},"ForumReplyMessage:message:1940106":{"__typename":"ForumReplyMessage","author":{"__ref":"User:user:775710"},"id":"message:1940106","entityType":"FORUM_REPLY","eventPath":"category:home-wifi-routers/category:home-networking/category:English/community:ejquo23388board:en-home-routers-nighthawk-wifi-ax6/message:1940042/message:1940106","revisionNum":1,"uid":1940106,"depth":3,"hasGivenKudo":false,"subscribed":false,"board":{"__ref":"Forum:board:en-home-routers-nighthawk-wifi-ax6"},"parent":{"__ref":"ForumReplyMessage:message:1940101"},"conversation":{"__ref":"Conversation:conversation:1940042"},"subject":"Re: Nighthawk AX4 not connecting to internet","moderationData":{"__ref":"ModerationData:moderation_data:1940106"},"body":"Just went through the setup process again and got the 5g working also. Back in business.