ICU-20980 BRS66GA Update version numbers and README files
diff --git a/icu4c/readme.html b/icu4c/readme.html
index f982556..a6acbd0 100644
--- a/icu4c/readme.html
+++ b/icu4c/readme.html
@@ -23,8 +23,8 @@
         milestone - if the release note is a milestone release
 -->
 
-  <!-- <body> -->
-  <body class="rc">
+  <body>
+  <!-- <body class="rc"> -->
     <p class="only-draft"><b>Note:</b> This is a draft readme.</p>
 
     <h1>
@@ -47,7 +47,7 @@
     <p class="note only-rc">This is a release candidate version of ICU4C.
       It is not recommended for production use.</p>
 
-    <p>Last updated: 2020-Feb-12<br/>
+    <p>Last updated: 2020-Mar-02<br/>
       Copyright &copy; 2016 and later: Unicode, Inc. and others. License &amp; terms of use:
       <a href="http://www.unicode.org/copyright.html">http://www.unicode.org/copyright.html</a><br/>
       Copyright &copy; 1997-2016 International Business Machines Corporation and others.
diff --git a/icu4j/build.properties b/icu4j/build.properties
index ac9dd49..02d9dd3 100644
--- a/icu4j/build.properties
+++ b/icu4j/build.properties
@@ -6,7 +6,7 @@
 #*******************************************************************************
 api.report.version = 66
 api.report.prev.version = 65
-release.file.ver = 66rc
-api.doc.version = 66 Release Candidate
-maven.pom.ver = 66.1-SNAPSHOT
+release.file.ver = 66_1
+api.doc.version = 66.1
+maven.pom.ver = 66.1
 
diff --git a/icu4j/main/shared/data/icudata.jar b/icu4j/main/shared/data/icudata.jar
index b462117..b40c538 100644
--- a/icu4j/main/shared/data/icudata.jar
+++ b/icu4j/main/shared/data/icudata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7e641819877ea4d794fa878ed139748a4d60c0ea164e1e7663727c9ae930192c
-size 12999311
+oid sha256:b68da43f2161b1baa997c755b4d97dcf4117bc546210dc5623e69864c8af347c
+size 12999317
diff --git a/icu4j/main/shared/data/icutzdata.jar b/icu4j/main/shared/data/icutzdata.jar
index 48a25eb..e389254 100644
--- a/icu4j/main/shared/data/icutzdata.jar
+++ b/icu4j/main/shared/data/icutzdata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:77f428565613830bb70e3efbefa2e90e73b897f582c83392c4cb9a150412d51b
+oid sha256:3abd55ac183151fdb12337ee60182c485a0fe141d6bdc260facecd197e23fc81
 size 94279
diff --git a/icu4j/main/shared/data/testdata.jar b/icu4j/main/shared/data/testdata.jar
index 63f6aaa..d78199e 100644
--- a/icu4j/main/shared/data/testdata.jar
+++ b/icu4j/main/shared/data/testdata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:6f4e2d5516ef6d4890ee5fa9fb552f204360c6371be87ba8fb36b0d04c4f4d20
+oid sha256:6425bfcad55287b62925d49a9d11f87f78ff6b92a0d6fbd80e43366aa18f0ad2
 size 726380
diff --git a/icu4j/readme.html b/icu4j/readme.html
index b2754fb..dee39d2 100644
--- a/icu4j/readme.html
+++ b/icu4j/readme.html
@@ -15,23 +15,23 @@
  link="#0000ff" vlink="#800080">
 <h1>International Components for Unicode for Java (ICU4J)</h1>
 <h2>Read Me for ICU4J 66.1</h2>
-(Last Update: 2020-Feb-12)
+(Last Update: 2020-Mar-02)
 <hr size="2" width="100%">
 
 <p>
-<!-- <b>Note:</b> This is major release of ICU4J. It contains bug fixes and adds implementations
-of inherited API and introduces new API or functionality. -->
+<b>Note:</b> This is major release of ICU4J. It contains bug fixes and adds implementations
+of inherited API and introduces new API or functionality.
 <!-- <b>Note:</b> This is a preview release of ICU4J 66.
 The contents of this document may not reflect the recent changes done
 for ICU 66 development. It is not recommended for production use. -->
 <!-- <b>Note:</b> This is a development milestone of ICU4J 66.
 The contents of this document may not reflect the recent changes done
 for ICU 66 development. It is not recommended for production use. -->
-<b>Note:</b> This is a release candidate of ICU4J 66.
+<!-- <b>Note:</b> This is a release candidate of ICU4J 66.
 The contents of this document may not reflect the recent changes done
 for ICU 66 development. This release candidate is intended for those
 wishing to verify ICU 66 integration before final release. It is not
-recommended for production use.
+recommended for production use. -->
 </p>
 <p>For the most recent release, see the <a
  href="http://www.icu-project.org/download/"> ICU4J