diff --git a/README.md b/README.md
index 1337aedd..40388124 100644
--- a/README.md
+++ b/README.md
@@ -58,11 +58,14 @@ As a next step, add a link to open cookie preferences after the consent was prev
 somewhere in the page footer, usually near "Terms of use" and "Privacy policy" links.
 
 ```html
-<a href="" data-cc="c-preferencesModal">Open cookie preferences</a>
+<a href="" data-cc="show-preferencesModal">Open cookie preferences</a>
 ```
 
 [👀 See demo page with example][examples].
 
+> [!NOTE]
+> It is legally required to provide the user a link to change cookie preferences even after the consent was given for the first time.
+
 ## Loading the plugin
 
 ### Via CDN or static file
diff --git a/UPGRADE-3.0.md b/UPGRADE-3.0.md
index 5b38ecf8..ecf1fbfd 100644
--- a/UPGRADE-3.0.md
+++ b/UPGRADE-3.0.md
@@ -1 +1,165 @@
 # Upgrade from 2.x to 3.0
+Release 3.0 includes backward-incompatible changes, including changes in the underlying vanilla-cookieconsent library,
+which has also been upgraded from version 2 to 3.
+
+This guide summarizes relevant changes in both `almacareer/cookie-consent` and `(vanilla-cookieconsent)[https://github.com/orestbida/cookieconsent]`
+library to help you upgrade your codebase.
+
+## Library npm namespace changed to `@almacareer`
+
+The library has been moved from `@lmc-eu` to `@almacareer` npm organization.
+
+If you use the library via npm, update your package.json file
+
+```diff
+-"@lmc-eu/cookie-consent": "^2.6.0"
++"@almacareer/cookie-consent": "^3.0.0"
+```
+
+If you use the library via CDN, update URL to styles and script:
+
+```diff
+-<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@lmc-eu/cookie-consent-manager@2/CookieConsentManager.min.css">
++<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@almacareer/cookie-consent-manager@3/CookieConsentManager.min.css">
+
+-<script defer src="https://cdn.jsdelivr.net/npm/@lmc-eu/cookie-consent-manager@2/init.js"></script>
++<script defer src="https://cdn.jsdelivr.net/npm/@almacareer/cookie-consent-manager@3/init.js"></script>
+```
+
+## Renamed init function
+
+The `lmc` prefix has been removed from the init function name.
+
+```diff
+-initLmcCookieConsentManager('demo.example', { /* ... */ });
++initCookieConsentManager('demo.example', { /* ... */ });
+```
+
+Also, the typescript type has been renamed from `LmcCookieConsentManager` to `CookieConsentManager`.
+
+## Data attribute to open the cookie preference window changed
+
+The `data-cc` attribute used to open the cookie settings window has been changed from `c-settings` to `show-preferencesModal`.
+
+```diff
+-<a href="" data-cc="c-settings">Open cookie settings</a>
++<a href="" data-cc="show-preferencesModal">Open cookie preferences</a>
+```
+
+> [!NOTE]
+> It is legally required to provide the user a link to change cookie preferences even after the consent was given for the first time.
+
+## Cookie has been renamed
+
+The cookie storing the consent data has been changed from `lmc_ccm` to `almacareer_ccm`. If you directly read the cookie value
+(either on backend or on frontend), you need to update the cookie name.
+
+> [!CAUTION]
+> **Keep in mind that renaming the cookie will cause all previously given consents to be re-requested from all users.**
+> This is expected and inevitable behavior with this change, as there is no legal way to migrate the old cookie to the
+> new one, as we technically can't transfer the validity period of the old consent to the new cookie.
+
+## Cookie content structure changed
+
+The internal structure of JSON cookie data has been changed and expanded.
+
+The main change is that `cookie.level` is now `cookie.categories`. If you work with cookie data on the server,
+you must update your server-side code to reflect this.
+
+### Before
+```json
+{
+  "level": [
+    "necessary",
+    "analytics",
+    "functionality",
+    "ad",
+    "personalization"
+  ],
+  "revision": 0,
+  "data": {
+    "serviceName": "demo.example",
+    "uid": "foo-bar-baz"
+  },
+  "rfc_cookie": true
+}
+```
+### After
+```json
+{
+  "categories": [
+    "necessary",
+    "analytics",
+    "functionality",
+    "ad",
+    "personalization"
+  ],
+  "revision": 0,
+  "data": {
+    "serviceName": "demo.example",
+    "uid": "foo-bar-baz"
+  },
+  "consentTimestamp": "2024-12-12T12:12:12.333Z",
+  "consentId": "f6152595-45a0-4371-aa68-2fe97137111a",
+  "services": {
+    "necessary": [],
+    "ad": [],
+    "analytics": [],
+    "functionality": [],
+    "personalization": []
+  },
+  "lastConsentTimestamp": "2024-12-12T12:12:12.333Z",
+  "expirationTime": 1764690394793
+}
+```
+
+## Data atribute to run third party scripts changed
+
+If you have conditional third-party scripts that depend on the consent category, you need to update the data attribute:
+
+```diff
+-<script data-cookiecategory="personalization" src="personalization.js" type="text/plain" defer></script>
++<script data-category="personalization" src="personalization.js" type="text/plain" defer></script>
+```
+## Method `allowedCategory()` renamed `acceptedCategory()`
+
+If you use the `allowedCategory()` method to check if a consent category is allowed and to run conditional code based
+on that, you need to rename the method to `acceptedCategory()`.
+
+```diff
+-if (cookieConsent.allowedCategory('personalization')) {
++if (cookieConsent.acceptedCategory('personalization')) {
+  // Run personalization code
+}
+```
+
+## Translation override `settingsModalMoreInfo` renamed
+
+To be in line with the vanilla-cookieconsent library terminology, the term "preferences" is used instead of "settings".
+If you used `translationOverrides` configuration, the key `settingsModalMoreInfo` has been renamed to `preferencesModalMoreInfo`.
+
+## Secondary button mode config removed
+
+Configuration option `secondaryButtonMode` has been removed.
+
+The consent dialog now always has primary button "Accept all" and secondary button "Accept necessary"
+with no option to reconfigure this.
+
+## Callbacks have been renamed and now have different parameters
+
+- All callbacks now always have parameters `cookie` and `cookieConsent`.
+- All callback parameters are now encapsulated in an object `{}` on the position of the first parameter.
+- Two callbacks have been renamed for consistency with the vanilla-cookieconsent library:
+  - `onAccept()` is now `onConsent()`
+  - `onFirstAccept` is now `onFirstConsent()`
+
+See readme for [callbacks documentation](README.md#callbacks).
+
+## Other notable changes
+
+- Legacy CommonJS support (CJS) has been removed. Use ESM import syntax instead.
+- `cookieTable` configuration does not affect in any way any cookies. Cookie table is used only for listing the cookies in preferences modal.
+  If you want to clear cookies by the underlying library, you can enable `autoClearCookies` and provide `autoClear` configuration in the `config` option.
+- `updateLanguage()` method of the underlying vanilla-cookieconsent library has been renamed to `setLanguage()`
+- `config` configuration option, which is used for overrides of the internal config of the underlying library is now deep merged,
+  which means that you can override only the properties you need to change, and the rest will be kept from the default config (even nested properties).